[407] | 1 | /////////////////////////////////////////////////////////////////////////////// |
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| 2 | // File : ksh.c |
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| 3 | // Date : October 2017 |
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| 4 | // Author : Alain Greiner |
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| 5 | /////////////////////////////////////////////////////////////////////////////// |
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| 6 | // This single thread application implement a simple shell for ALMOS-MKH. |
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| 7 | /////////////////////////////////////////////////////////////////////////////// |
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[230] | 8 | |
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| 9 | #include <stdio.h> |
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| 10 | #include <stdlib.h> |
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| 11 | #include <string.h> |
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[416] | 12 | #include <shared_syscalls.h> |
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[230] | 13 | |
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[407] | 14 | #define CMD_MAX_SIZE (256) // max number of characters in one command |
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[436] | 15 | #define LOG_DEPTH (32) // max number of registered commands |
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[407] | 16 | #define MAX_ARGS (32) // max number of arguments in a command |
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| 17 | #define FIFO_SIZE (1024) // FIFO depth for recursive ls |
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[230] | 18 | |
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[407] | 19 | //////////////////////////////////////////////////////////////////////////////// |
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| 20 | // Structures |
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| 21 | //////////////////////////////////////////////////////////////////////////////// |
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[230] | 22 | |
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[407] | 23 | // one entry in the registered commands array |
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| 24 | typedef struct log_entry_s |
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| 25 | { |
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| 26 | char buf[CMD_MAX_SIZE]; |
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| 27 | unsigned int count; |
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| 28 | } |
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| 29 | log_entry_t; |
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[230] | 30 | |
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[407] | 31 | // one entry in the supported command types array |
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| 32 | typedef struct ksh_cmd_s |
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| 33 | { |
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| 34 | char * name; |
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| 35 | char * desc; |
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| 36 | void (*fn)( int , char ** ); |
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| 37 | } |
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| 38 | ksh_cmd_t; |
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| 39 | |
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| 40 | |
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[230] | 41 | //////////////////////////////////////////////////////////////////////////////// |
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| 42 | // Global Variables |
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| 43 | //////////////////////////////////////////////////////////////////////////////// |
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| 44 | |
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[407] | 45 | ksh_cmd_t cmd[]; // array of supported commands |
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[230] | 46 | |
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[407] | 47 | log_entry_t log_entries[LOG_DEPTH]; // array of registered commands |
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[230] | 48 | |
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[407] | 49 | unsigned int ptw; // write pointer in log_entries[] |
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| 50 | unsigned int ptr; // read pointer in log_entries[] |
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[230] | 51 | |
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| 52 | //////////////////////////////////////////////////////////////////////////////// |
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| 53 | // Shell Commands |
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| 54 | //////////////////////////////////////////////////////////////////////////////// |
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| 55 | |
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[407] | 56 | ///////////////////////////////////////////// |
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| 57 | static void cmd_cat( int argc , char **argv ) |
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[230] | 58 | { |
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[407] | 59 | char * path; |
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[230] | 60 | |
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[407] | 61 | if (argc != 2) |
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| 62 | { |
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[409] | 63 | printf(" usage: cat pathname\n"); |
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[230] | 64 | return; |
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| 65 | } |
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[407] | 66 | |
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[230] | 67 | path = argv[1]; |
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| 68 | |
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[409] | 69 | printf(" error: not implemented yet\n"); |
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[407] | 70 | |
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| 71 | /* |
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| 72 | // open the file |
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| 73 | fd = open( path , O_RDONLY , 0 ); |
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| 74 | if (fd < 0) |
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| 75 | { |
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[409] | 76 | printf(" error: cannot open %s\n", path); |
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[230] | 77 | goto exit; |
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| 78 | } |
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| 79 | |
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[407] | 80 | // get file size |
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| 81 | if (stat(path, &st) == -1) |
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| 82 | { |
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[409] | 83 | printf(" error: cannot stat %s\n", path); |
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[230] | 84 | goto exit; |
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| 85 | } |
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| 86 | if (S_ISDIR(st.st_mode)) { |
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[409] | 87 | printf(" error: %s is a directory\n", path); |
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[230] | 88 | goto exit; |
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| 89 | } |
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| 90 | size = st.st_size; |
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| 91 | |
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[407] | 92 | // mmap the file |
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[230] | 93 | buf = mmap(NULL, size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0); |
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| 94 | if (buf == NULL || buf == (char *)-1) { |
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[409] | 95 | printf(" error: cannot map %s\n", path); |
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[230] | 96 | goto exit; |
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| 97 | } |
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| 98 | |
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[407] | 99 | // set terminating '0' XXX |
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[230] | 100 | buf[size-1] = 0; |
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| 101 | |
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[407] | 102 | // display the file content |
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[230] | 103 | printf("%s", buf); |
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| 104 | |
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| 105 | exit: |
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[407] | 106 | if (buf != NULL) munmap(buf, size); |
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| 107 | if (fd >= 0) close(fd); |
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| 108 | */ |
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[230] | 109 | |
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[407] | 110 | } // end cmd_cat() |
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| 111 | |
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| 112 | //////////////////////////////////////////// |
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| 113 | static void cmd_cd( int argc , char **argv ) |
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| 114 | { |
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| 115 | char * path; |
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| 116 | |
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| 117 | if (argc != 2) |
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| 118 | { |
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[409] | 119 | printf(" usage: cd pathname\n"); |
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[407] | 120 | return; |
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| 121 | } |
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| 122 | |
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| 123 | path = argv[1]; |
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| 124 | |
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[409] | 125 | printf(" error: not implemented yet\n"); |
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[407] | 126 | /* |
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| 127 | path = argv[1]; |
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| 128 | |
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| 129 | if (chdir(path) == -1) |
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| 130 | { |
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[409] | 131 | printf(" error: cannot cd to %s\n", path); |
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[407] | 132 | } |
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| 133 | */ |
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| 134 | |
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| 135 | } // end cmd_cd() |
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| 136 | |
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| 137 | ///////////////////////////////////////// |
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[230] | 138 | static void cmd_cp(int argc, char **argv) |
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| 139 | { |
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[407] | 140 | // int src_fd = -1, dst_fd = -1; |
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| 141 | // char *srcpath, *dstpath; |
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| 142 | // struct stat st; |
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| 143 | // size_t size, i; |
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| 144 | // char buf[1024]; |
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[230] | 145 | |
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[407] | 146 | if (argc != 3) |
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| 147 | { |
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[409] | 148 | printf(" usage: cp src_pathname dst_pathname\n"); |
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[230] | 149 | return; |
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| 150 | } |
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| 151 | |
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[409] | 152 | printf(" error: not implemented yet\n"); |
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[407] | 153 | |
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| 154 | /* |
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[230] | 155 | srcpath = argv[1]; |
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| 156 | dstpath = argv[2]; |
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| 157 | |
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[407] | 158 | // open the src file |
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[230] | 159 | src_fd = open(srcpath, O_RDONLY, 0); |
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| 160 | if (src_fd < 0) { |
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[409] | 161 | printf(" error: cannot open %s / err = %d\n", srcpath, errno); |
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[230] | 162 | goto exit; |
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| 163 | } |
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| 164 | |
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[407] | 165 | // get file size |
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[230] | 166 | if (stat(srcpath, &st) == -1) { |
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[409] | 167 | printf(" error: cannot stat %s\n", srcpath); |
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[230] | 168 | goto exit; |
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| 169 | } |
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| 170 | if (S_ISDIR(st.st_mode)) { |
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[409] | 171 | printf(" error: %s is a directory\n", srcpath); |
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[230] | 172 | goto exit; |
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| 173 | } |
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| 174 | size = st.st_size; |
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| 175 | |
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[407] | 176 | // open the dst file |
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[230] | 177 | dst_fd = open(dstpath, O_CREAT|O_TRUNC|O_RDWR, 0); |
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| 178 | if (dst_fd < 0) { |
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[409] | 179 | printf(" error: cannot open %s / err = %d\n", dstpath, errno); |
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[230] | 180 | goto exit; |
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| 181 | } |
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| 182 | if (stat(dstpath, &st) == -1) { |
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[409] | 183 | printf(" error: cannot stat %s\n", dstpath); |
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[230] | 184 | goto exit; |
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| 185 | } |
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| 186 | if (S_ISDIR(st.st_mode)) { |
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[409] | 187 | printf(" error: %s is a directory\n", dstpath); |
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[230] | 188 | goto exit; |
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| 189 | } |
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| 190 | |
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| 191 | i = 0; |
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| 192 | while (i < size) |
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| 193 | { |
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| 194 | size_t rlen = (size - i < 1024 ? size - i : 1024); |
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| 195 | size_t wlen; |
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| 196 | ssize_t ret; |
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| 197 | |
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[407] | 198 | // read the source |
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[230] | 199 | ret = read(src_fd, buf, rlen); |
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| 200 | if (ret == -1) { |
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[409] | 201 | printf(" error: cannot read from file %s\n", srcpath); |
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[230] | 202 | goto exit; |
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| 203 | } |
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| 204 | rlen = (size_t)ret; |
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| 205 | |
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[407] | 206 | // write to the destination |
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[230] | 207 | ret = write(dst_fd, buf, rlen); |
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| 208 | if (ret == -1) { |
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[409] | 209 | printf(" error: cannot write to file %s\n", dstpath); |
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[230] | 210 | goto exit; |
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| 211 | } |
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| 212 | wlen = (size_t)ret; |
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| 213 | |
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[407] | 214 | // check |
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[230] | 215 | if (wlen != rlen) { |
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[409] | 216 | printf(" error: cannot write on device\n"); |
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[230] | 217 | goto exit; |
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| 218 | } |
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| 219 | |
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| 220 | i += rlen; |
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| 221 | } |
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| 222 | |
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| 223 | exit: |
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[407] | 224 | if (src_fd >= 0) close(src_fd); |
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| 225 | if (dst_fd >= 0) close(dst_fd); |
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| 226 | */ |
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[230] | 227 | |
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[407] | 228 | } // end cmd_cp() |
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| 229 | |
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[436] | 230 | ///////////////////////////////////////////////// |
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| 231 | static void cmd_display( int argc , char **argv ) |
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| 232 | { |
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| 233 | unsigned int cxy; |
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| 234 | unsigned int lid; |
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| 235 | unsigned int pid; |
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| 236 | unsigned int txt_id; |
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| 237 | |
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| 238 | if( strcmp( argv[1] , "vmm" ) == 0 ) |
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| 239 | { |
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| 240 | if( argc != 3 ) |
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| 241 | { |
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| 242 | printf(" usage: display vmm pid\n"); |
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| 243 | return; |
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| 244 | } |
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| 245 | |
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| 246 | pid = atoi(argv[2]); |
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| 247 | |
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| 248 | if( display_vmm( pid ) ) |
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| 249 | { |
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| 250 | printf(" error: illegal arguments pid = %x\n", pid ); |
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| 251 | } |
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| 252 | } |
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| 253 | else if( strcmp( argv[1] , "sched" ) == 0 ) |
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| 254 | { |
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| 255 | if( argc != 4 ) |
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| 256 | { |
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| 257 | printf(" usage: display sched cxy lid\n"); |
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| 258 | return; |
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| 259 | } |
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| 260 | |
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| 261 | cxy = atoi(argv[2]); |
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| 262 | lid = atoi(argv[3]); |
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| 263 | |
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| 264 | if( display_sched( cxy , lid ) ) |
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| 265 | { |
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| 266 | printf(" error: illegal arguments cxy = %x / lid = %d\n", cxy, lid ); |
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| 267 | } |
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| 268 | } |
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| 269 | else if( strcmp( argv[1] , "process" ) == 0 ) |
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| 270 | { |
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| 271 | if( argc != 3 ) |
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| 272 | { |
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| 273 | printf(" usage: display process cxy\n"); |
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| 274 | return; |
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| 275 | } |
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| 276 | |
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| 277 | cxy = atoi(argv[2]); |
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| 278 | |
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| 279 | if( display_cluster_processes( cxy ) ) |
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| 280 | { |
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| 281 | printf(" error: illegal argument cxy = %x\n", cxy ); |
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| 282 | } |
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| 283 | } |
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| 284 | else if( strcmp( argv[1] , "txt" ) == 0 ) |
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| 285 | { |
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| 286 | if( argc != 3 ) |
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| 287 | { |
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| 288 | printf(" usage: display txt txt_id\n"); |
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| 289 | return; |
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| 290 | } |
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| 291 | |
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| 292 | txt_id = atoi(argv[2]); |
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| 293 | |
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| 294 | if( display_txt_processes( txt_id ) ) |
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| 295 | { |
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| 296 | printf(" error: illegal argument txt_id = %x\n", txt_id ); |
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| 297 | } |
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| 298 | } |
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| 299 | else if( strcmp( argv[1] , "vfs" ) == 0 ) |
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| 300 | { |
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| 301 | if( argc != 2 ) |
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| 302 | { |
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| 303 | printf(" usage: display vfs\n"); |
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| 304 | return; |
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| 305 | } |
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| 306 | |
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| 307 | display_vfs(); |
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| 308 | } |
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| 309 | else if( strcmp( argv[1] , "chdev" ) == 0 ) |
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| 310 | { |
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| 311 | if( argc != 2 ) |
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| 312 | { |
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| 313 | printf(" usage: display chdev\n"); |
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| 314 | return; |
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| 315 | } |
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| 316 | |
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| 317 | display_chdev(); |
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| 318 | } |
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| 319 | else |
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| 320 | { |
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| 321 | printf(" usage: display (vmm/sched/process/vfs/chdev/txt) [arg2] [arg3]\n"); |
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| 322 | } |
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| 323 | } // end cmd_display() |
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| 324 | |
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[427] | 325 | ///////////////////////////////////////// |
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| 326 | static void cmd_fg(int argc, char **argv) |
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| 327 | { |
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| 328 | unsigned int pid; |
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| 329 | |
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| 330 | if (argc != 2) |
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| 331 | { |
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| 332 | printf(" usage: %s pid\n", argv[0]); |
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| 333 | return; |
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| 334 | } |
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| 335 | |
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| 336 | pid = atoi( argv[1] ); |
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| 337 | |
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| 338 | if( pid == 0 ) |
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| 339 | { |
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| 340 | printf(" error: ilegal pid format\n" ); |
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| 341 | } |
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| 342 | |
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| 343 | if( fg( pid ) ) |
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| 344 | { |
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| 345 | printf(" error: cannot find process %x\n", pid ); |
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| 346 | } |
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[436] | 347 | } // end cmd_fg() |
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[427] | 348 | |
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[407] | 349 | ////////////////////////////////////////////// |
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| 350 | static void cmd_help( int argc , char **argv ) |
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[230] | 351 | { |
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[407] | 352 | unsigned int i; |
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[230] | 353 | |
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[407] | 354 | if (argc != 1) |
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| 355 | { |
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[409] | 356 | printf(" usage: %s\n", argv[0]); |
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[230] | 357 | return; |
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| 358 | } |
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| 359 | |
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| 360 | printf("available commands:\n"); |
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[407] | 361 | for (i = 0 ; cmd[i].name ; i++) |
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| 362 | { |
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[230] | 363 | printf("\t%s\t : %s\n", cmd[i].name , cmd[i].desc); |
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| 364 | } |
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[407] | 365 | } // end cmd_help() |
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[230] | 366 | |
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[407] | 367 | ////////////////////////////////////////////// |
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| 368 | static void cmd_kill( int argc , char **argv ) |
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[230] | 369 | { |
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[407] | 370 | unsigned int pid; |
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[230] | 371 | |
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[407] | 372 | if (argc != 2) |
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| 373 | { |
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[409] | 374 | printf(" usage: %s pid\n", argv[0]); |
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[230] | 375 | return; |
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| 376 | } |
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| 377 | |
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[427] | 378 | pid = atoi( argv[1] ); |
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[230] | 379 | |
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[427] | 380 | if( pid == 0 ) |
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| 381 | { |
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| 382 | printf(" error: ilegal pid format\n" ); |
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| 383 | } |
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| 384 | |
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[416] | 385 | if( kill( pid , SIGKILL ) ) |
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[407] | 386 | { |
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[409] | 387 | printf(" error: unable to kill process %x\n", pid ); |
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[230] | 388 | } |
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[407] | 389 | } // end cmd_kill() |
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[230] | 390 | |
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[407] | 391 | ////////////////////////////////////////////// |
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| 392 | static void cmd_load( int argc , char **argv ) |
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[230] | 393 | { |
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[436] | 394 | int ret_fork; // return value from fork |
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| 395 | int ret_exec; // return value from exec |
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| 396 | unsigned int ksh_pid; // KSH process PID |
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| 397 | unsigned int new_pid; // new process PID |
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| 398 | unsigned int rcv_pid; // terminating process PID |
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| 399 | char * pathname; // path to .elf file |
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| 400 | unsigned int background; // background execution if non zero |
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| 401 | int status; // new process exit status |
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[407] | 402 | |
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[427] | 403 | if( (argc < 2) || (argc > 3) ) |
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[407] | 404 | { |
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[434] | 405 | printf(" usage: %s pathname [&]\n", argv[0] ); |
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[407] | 406 | return; |
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| 407 | } |
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| 408 | |
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| 409 | pathname = argv[1]; |
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| 410 | |
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[427] | 411 | if( argc == 3 ) background = (argv[2][0] == '&'); |
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[434] | 412 | else background = 0; |
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[427] | 413 | |
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[434] | 414 | // get KSH process PID |
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| 415 | ksh_pid = getpid(); |
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[407] | 416 | |
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[434] | 417 | // KSH process fork CHILD process |
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[436] | 418 | ret_fork = fork(); |
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[434] | 419 | |
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[436] | 420 | if ( ret_fork < 0 ) // it is a failure reported to KSH |
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[407] | 421 | { |
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[434] | 422 | printf(" error: ksh process unable to fork\n"); |
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| 423 | } |
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[436] | 424 | else if (ret_fork == 0) // it is the CHILD process |
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[434] | 425 | { |
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[436] | 426 | // give back to KSH terminal ownership if required |
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[434] | 427 | if( background ) fg( ksh_pid ); |
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| 428 | |
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| 429 | // CHILD process exec NEW process |
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[436] | 430 | ret_exec = exec( pathname , NULL , NULL ); |
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[434] | 431 | |
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[436] | 432 | if( ret_exec ) |
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[409] | 433 | { |
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| 434 | printf(" error: new process unable to exec <%s>\n", pathname ); |
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| 435 | exit(0); |
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[436] | 436 | } |
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| 437 | } |
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| 438 | else // it is the parent KSH : ret_fork is the new process PID |
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| 439 | { |
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| 440 | new_pid = ret_fork; |
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| 441 | |
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| 442 | // wait new process completion |
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| 443 | rcv_pid = wait( &status ); |
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| 444 | |
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| 445 | if( rcv_pid == new_pid ) |
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| 446 | { |
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| 447 | printf("\n\n exit %s / status = %x\n\n", pathname, (status &0xFF) ); |
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[409] | 448 | } |
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[436] | 449 | else |
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| 450 | { |
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| 451 | printf("\n\n abnormal termination for %s \n\n", pathname ); |
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| 452 | } |
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| 453 | } |
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| 454 | |
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[407] | 455 | } // end cmd_load |
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| 456 | |
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| 457 | ///////////////////////////////////////////// |
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| 458 | static void cmd_log( int argc , char **argv ) |
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| 459 | { |
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| 460 | unsigned int i; |
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| 461 | |
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[230] | 462 | printf("--- registered commands ---\n"); |
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[407] | 463 | for (i = 0; i < LOG_DEPTH; i++) |
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| 464 | { |
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[436] | 465 | printf(" - %d\t: %s\n", i, &log_entries[i].buf); |
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[230] | 466 | } |
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| 467 | } |
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| 468 | |
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[407] | 469 | //////////////////////////////////////////// |
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| 470 | static void cmd_ls( int argc , char **argv ) |
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[230] | 471 | { |
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[407] | 472 | char * path; |
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[230] | 473 | |
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[407] | 474 | // struct dirent * file; |
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| 475 | // DIR *dir; |
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| 476 | |
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| 477 | if (argc == 1) |
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| 478 | { |
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[230] | 479 | path = "."; |
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[407] | 480 | } |
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| 481 | else if (argc == 2) |
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| 482 | { |
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[230] | 483 | path = argv[1]; |
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[407] | 484 | } |
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| 485 | else |
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| 486 | { |
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[409] | 487 | printf(" usage: ls [path]\n"); |
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[230] | 488 | return; |
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| 489 | } |
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| 490 | |
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[409] | 491 | printf(" error: not implemented yet\n"); |
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[407] | 492 | /* |
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| 493 | dir = opendir( path ); |
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[230] | 494 | while ((file = readdir(dir)) != NULL) |
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| 495 | { |
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| 496 | printf(" %s\n", file->d_name); |
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| 497 | } |
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| 498 | closedir(dir); |
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[407] | 499 | */ |
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[230] | 500 | } |
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| 501 | |
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[407] | 502 | /////////////////////////////////////////////// |
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| 503 | static void cmd_mkdir( int argc , char **argv ) |
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[230] | 504 | { |
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[407] | 505 | char * pathname; |
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[230] | 506 | |
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[407] | 507 | if (argc != 2) |
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| 508 | { |
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[409] | 509 | printf(" usage: mkdir pathname\n"); |
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[230] | 510 | return; |
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| 511 | } |
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| 512 | |
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[407] | 513 | pathname = argv[1]; |
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[230] | 514 | |
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[409] | 515 | printf(" error: not implemented yet\n"); |
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[407] | 516 | /* |
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| 517 | if ( mkdir( path, 0x700) == -1 ) |
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| 518 | { |
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[409] | 519 | printf(" error: cannot create directory %s\n", path); |
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[230] | 520 | } |
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[407] | 521 | */ |
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[230] | 522 | } |
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| 523 | |
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[407] | 524 | //////////////////////////////////////////// |
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| 525 | static void cmd_mv( int argc , char **argv ) |
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[230] | 526 | { |
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[407] | 527 | |
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[230] | 528 | if (argc < 3) |
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| 529 | { |
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| 530 | printf(" usage : %s src_pathname dst_pathname\n", argv[0]); |
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| 531 | return; |
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| 532 | } |
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| 533 | |
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[409] | 534 | printf(" error: not implemented yet\n"); |
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[407] | 535 | |
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| 536 | /* |
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[230] | 537 | int ret = giet_fat_rename(argv[1], argv[2]); |
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| 538 | if (ret < 0) |
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| 539 | { |
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[409] | 540 | printf(" error : cannot move %s to %s / err = %d\n", argv[1], argv[2], ret ); |
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[230] | 541 | } |
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[407] | 542 | */ |
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| 543 | |
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[230] | 544 | } |
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| 545 | |
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[407] | 546 | ///////////////////////////////////////////// |
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| 547 | static void cmd_pwd( int argc , char **argv ) |
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[230] | 548 | { |
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[407] | 549 | char buf[1024]; |
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[230] | 550 | |
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[407] | 551 | if (argc != 1) |
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| 552 | { |
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[409] | 553 | printf(" usage: pwd\n"); |
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[407] | 554 | return; |
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| 555 | } |
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| 556 | |
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| 557 | if ( getcwd( buf , 1024 ) ) |
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| 558 | { |
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[409] | 559 | printf(" error: unable to get current directory\n"); |
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[407] | 560 | } |
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| 561 | else |
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| 562 | { |
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| 563 | printf("%s\n", buf); |
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| 564 | } |
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| 565 | } |
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| 566 | |
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| 567 | //////////////////////////////////////////// |
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| 568 | static void cmd_rm( int argc , char **argv ) |
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| 569 | { |
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| 570 | char * pathname; |
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| 571 | |
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| 572 | if (argc != 2) |
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| 573 | { |
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[409] | 574 | printf(" usage: rm pathname\n"); |
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[230] | 575 | return; |
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| 576 | } |
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| 577 | |
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[407] | 578 | pathname = argv[1]; |
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[230] | 579 | |
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[409] | 580 | printf(" error: not implemented yet\n"); |
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[407] | 581 | /* |
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| 582 | if (remove(path) == -1) |
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| 583 | { |
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[409] | 584 | printf(" error: cannot remove %s\n", path); |
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[230] | 585 | } |
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[407] | 586 | */ |
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| 587 | |
---|
[230] | 588 | } |
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| 589 | |
---|
[407] | 590 | /////////////////////////////////////////////// |
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| 591 | static void cmd_rmdir( int argc , char **argv ) |
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[230] | 592 | { |
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| 593 | cmd_rm(argc, argv); |
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| 594 | } |
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| 595 | |
---|
[407] | 596 | ////////////////////////////////////////////////////////////////// |
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| 597 | // Array of commands |
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| 598 | ////////////////////////////////////////////////////////////////// |
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[230] | 599 | |
---|
[407] | 600 | ksh_cmd_t cmd[] = |
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[230] | 601 | { |
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[435] | 602 | { "cat", "display file content", cmd_cat }, |
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| 603 | { "cd", "change current directory", cmd_cd }, |
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| 604 | { "cp", "replicate a file in file system", cmd_cp }, |
---|
| 605 | { "fg", "put a process in foreground", cmd_fg }, |
---|
| 606 | { "display", "display vmm/sched/process/vfs/chdev/txt", cmd_display }, |
---|
| 607 | { "load", "load an user application", cmd_load }, |
---|
| 608 | { "help", "list available commands", cmd_help }, |
---|
| 609 | { "kill", "kill an application (all threads)", cmd_kill }, |
---|
| 610 | { "log", "list registered commands", cmd_log }, |
---|
| 611 | { "ls", "list directory entries", cmd_ls }, |
---|
| 612 | { "mkdir", "create a new directory", cmd_mkdir }, |
---|
| 613 | { "mv", "move a file in file system", cmd_mv }, |
---|
| 614 | { "pwd", "print current working directory", cmd_pwd }, |
---|
| 615 | { "rm", "remove a file from file system", cmd_rm }, |
---|
| 616 | { "rmdir", "remove a directory from file system", cmd_rmdir }, |
---|
| 617 | { NULL, NULL, NULL } |
---|
[230] | 618 | }; |
---|
| 619 | |
---|
[407] | 620 | //////////////////////////////////////////////////////////////////////////////////// |
---|
| 621 | // This function analyses one command (with arguments), execute it, and return. |
---|
| 622 | //////////////////////////////////////////////////////////////////////////////////// |
---|
[230] | 623 | static void parse(char *buf) |
---|
| 624 | { |
---|
| 625 | int argc = 0; |
---|
| 626 | char *argv[MAX_ARGS]; |
---|
| 627 | int i; |
---|
| 628 | int len = strlen(buf); |
---|
| 629 | |
---|
| 630 | // build argc/argv |
---|
[407] | 631 | for (i = 0; i < len; i++) |
---|
| 632 | { |
---|
| 633 | if (buf[i] == ' ') |
---|
| 634 | { |
---|
[230] | 635 | buf[i] = '\0'; |
---|
[407] | 636 | } |
---|
| 637 | else if (i == 0 || buf[i - 1] == '\0') |
---|
| 638 | { |
---|
| 639 | if (argc < MAX_ARGS) |
---|
| 640 | { |
---|
[230] | 641 | argv[argc] = &buf[i]; |
---|
| 642 | argc++; |
---|
| 643 | } |
---|
| 644 | } |
---|
| 645 | } |
---|
| 646 | |
---|
[407] | 647 | if (argc > 0) |
---|
| 648 | { |
---|
[230] | 649 | int found = 0; |
---|
| 650 | |
---|
| 651 | argv[argc] = NULL; |
---|
| 652 | |
---|
[407] | 653 | // try to match typed command |
---|
| 654 | for (i = 0; cmd[i].name; i++) |
---|
| 655 | { |
---|
| 656 | if (strcmp(argv[0], cmd[i].name) == 0) |
---|
| 657 | { |
---|
[230] | 658 | cmd[i].fn(argc, argv); |
---|
| 659 | found = 1; |
---|
| 660 | break; |
---|
| 661 | } |
---|
| 662 | } |
---|
| 663 | |
---|
[407] | 664 | if (!found) |
---|
| 665 | { |
---|
[434] | 666 | printf(" undefined command <%s>\n", argv[0]); |
---|
[230] | 667 | } |
---|
| 668 | } |
---|
| 669 | } |
---|
| 670 | |
---|
[407] | 671 | /////////////////////////////////// |
---|
| 672 | int main( int argc , char *argv[] ) |
---|
[230] | 673 | { |
---|
[407] | 674 | char c; // read character |
---|
| 675 | char buf[CMD_MAX_SIZE]; // buffer for one command |
---|
| 676 | unsigned int count = 0; // pointer in buf |
---|
| 677 | unsigned int i; // index for loops |
---|
[230] | 678 | |
---|
[407] | 679 | enum fsm_states |
---|
| 680 | { |
---|
[230] | 681 | NORMAL, |
---|
| 682 | ESCAPE, |
---|
| 683 | BRAKET, |
---|
| 684 | }; |
---|
| 685 | |
---|
[407] | 686 | // log buffer initialisation |
---|
| 687 | memset( &log_entries , 0, sizeof(log_entries)); |
---|
| 688 | ptw = 0; |
---|
| 689 | ptr = 0; |
---|
[230] | 690 | |
---|
| 691 | printf( "~~~ shell ~~~\n\n" ); |
---|
| 692 | |
---|
| 693 | // command buffer initialisation |
---|
[407] | 694 | memset( buf, 0x20 , sizeof(buf) ); |
---|
[230] | 695 | count = 0; |
---|
| 696 | |
---|
| 697 | // display first prompt |
---|
| 698 | printf("# "); |
---|
| 699 | |
---|
| 700 | // This lexical analyser writes one command line in the buf buffer. |
---|
| 701 | // It is implemented as a 3 states FSM to handle the following sequences: |
---|
| 702 | // - ESC [ A : up arrow |
---|
| 703 | // - ESC [ B : down arrow |
---|
| 704 | // - ESC [ C : right arrow |
---|
| 705 | // - ESC [ D : left arrow |
---|
[407] | 706 | // The three states have the following semantic: |
---|
[230] | 707 | // - NORMAL : no (ESC) character has been found |
---|
| 708 | // - ESCAPE : the character (ESC) has been found |
---|
| 709 | // - BRAKET : the wo characters (ESC,[) have been found |
---|
[436] | 710 | |
---|
[230] | 711 | unsigned int state = NORMAL; |
---|
| 712 | |
---|
[407] | 713 | // @@@ |
---|
[416] | 714 | // parse("load /bin/user/sort.elf"); |
---|
[407] | 715 | // @@@ |
---|
[408] | 716 | |
---|
[230] | 717 | while (1) |
---|
| 718 | { |
---|
[407] | 719 | c = (char)getchar(); |
---|
[230] | 720 | |
---|
[407] | 721 | if( c == 0 ) continue; |
---|
| 722 | |
---|
[230] | 723 | switch (state) |
---|
| 724 | { |
---|
| 725 | case NORMAL: |
---|
| 726 | { |
---|
| 727 | if ((c == '\b') || (c == 0x7F)) // backspace => remove one character |
---|
| 728 | { |
---|
| 729 | if (count > 0) { |
---|
| 730 | printf("\b \b"); |
---|
| 731 | count--; |
---|
| 732 | } |
---|
| 733 | } |
---|
| 734 | else if (c == '\n') // new line => call parser to execute command |
---|
| 735 | { |
---|
| 736 | if (count > 0) |
---|
| 737 | { |
---|
| 738 | // complete command |
---|
| 739 | buf[count] = '\0'; |
---|
| 740 | |
---|
| 741 | // register command in log arrays |
---|
| 742 | strcpy(log_entries[ptw].buf, buf); |
---|
| 743 | log_entries[ptw].count = count; |
---|
| 744 | ptw = (ptw + 1) % LOG_DEPTH; |
---|
| 745 | ptr = ptw; |
---|
| 746 | |
---|
| 747 | // execute command |
---|
| 748 | printf("\n"); |
---|
| 749 | parse((char *)&buf); |
---|
| 750 | |
---|
| 751 | // reinitialise buffer and display prompt |
---|
| 752 | for ( i = 0 ; i < sizeof(buf) ; i++ ) buf[i] = 0x20; |
---|
| 753 | count = 0; |
---|
| 754 | printf("# "); |
---|
| 755 | } |
---|
| 756 | } |
---|
| 757 | else if (c == '\t') // tabulation => do nothing |
---|
| 758 | { |
---|
| 759 | } |
---|
[436] | 760 | else if (c == (char)0x1B) // ESC => start an escape sequence |
---|
[230] | 761 | { |
---|
| 762 | state = ESCAPE; |
---|
| 763 | } |
---|
| 764 | else if (c == 0x03) // ^C => cancel current command |
---|
| 765 | { |
---|
| 766 | for (i = 0; i < count; i++) printf("\b \b"); |
---|
| 767 | for (i = 0; i < sizeof(buf); i++) buf[i] = 0x20; |
---|
| 768 | count = 0; |
---|
| 769 | } |
---|
| 770 | else // register character in command buffer |
---|
| 771 | { |
---|
| 772 | if (count < sizeof(buf) - 1) |
---|
| 773 | { |
---|
[418] | 774 | putchar( c ); |
---|
[230] | 775 | buf[count] = c; |
---|
| 776 | count++; |
---|
| 777 | } |
---|
| 778 | } |
---|
| 779 | break; |
---|
| 780 | } |
---|
| 781 | case ESCAPE: |
---|
| 782 | { |
---|
| 783 | if (c == '[') // valid sequence => continue |
---|
| 784 | { |
---|
| 785 | state = BRAKET; |
---|
| 786 | } |
---|
| 787 | else // invalid sequence => do nothing |
---|
| 788 | { |
---|
| 789 | state = NORMAL; |
---|
| 790 | } |
---|
| 791 | break; |
---|
| 792 | } |
---|
| 793 | case BRAKET: |
---|
| 794 | { |
---|
| 795 | if (c == 'D') // valid LEFT sequence => move buf pointer left |
---|
| 796 | { |
---|
| 797 | if (count > 0) |
---|
| 798 | { |
---|
| 799 | printf("\b"); |
---|
| 800 | count--; |
---|
| 801 | } |
---|
| 802 | |
---|
| 803 | // get next user char |
---|
| 804 | state = NORMAL; |
---|
| 805 | } |
---|
| 806 | else if (c == 'C') // valid RIGHT sequence => move buf pointer right |
---|
| 807 | { |
---|
| 808 | if (count < sizeof(buf) - 1) |
---|
| 809 | { |
---|
| 810 | printf("%c", buf[count]); |
---|
| 811 | count++; |
---|
| 812 | } |
---|
| 813 | |
---|
| 814 | // get next user char |
---|
| 815 | state = NORMAL; |
---|
| 816 | } |
---|
| 817 | else if (c == 'A') // valid UP sequence => move log pointer backward |
---|
| 818 | { |
---|
| 819 | // cancel current command |
---|
| 820 | for (i = 0; i < count; i++) printf("\b \b"); |
---|
| 821 | count = 0; |
---|
| 822 | |
---|
| 823 | // copy log command into buf |
---|
| 824 | ptr = (ptr - 1) % LOG_DEPTH; |
---|
| 825 | strcpy(buf, log_entries[ptr].buf); |
---|
| 826 | count = log_entries[ptr].count; |
---|
| 827 | |
---|
| 828 | // display log command |
---|
| 829 | printf("%s", buf); |
---|
| 830 | |
---|
| 831 | // get next user char |
---|
| 832 | state = NORMAL; |
---|
| 833 | } |
---|
| 834 | else if (c == 'B') // valid DOWN sequence => move log pointer forward |
---|
| 835 | { |
---|
| 836 | // cancel current command |
---|
| 837 | for (i = 0 ; i < count; i++) printf("\b \b"); |
---|
| 838 | count = 0; |
---|
| 839 | |
---|
| 840 | // copy log command into buf |
---|
| 841 | ptr = (ptr + 1) % LOG_DEPTH; |
---|
| 842 | strcpy(buf, log_entries[ptr].buf); |
---|
| 843 | count = log_entries[ptr].count; |
---|
| 844 | |
---|
| 845 | // display log command |
---|
| 846 | printf("%s", buf); |
---|
| 847 | |
---|
| 848 | // get next user char |
---|
| 849 | state = NORMAL; |
---|
| 850 | } |
---|
| 851 | else // other character => do nothing |
---|
| 852 | { |
---|
| 853 | // get next user char |
---|
| 854 | state = NORMAL; |
---|
| 855 | } |
---|
| 856 | break; |
---|
| 857 | } |
---|
| 858 | } |
---|
| 859 | } |
---|
[436] | 860 | } // end main() |
---|
[230] | 861 | |
---|