[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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| 15 | #define LOG_DEPTH (256) // max number of registered commands |
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| 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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[427] | 230 | ///////////////////////////////////////// |
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| 231 | static void cmd_fg(int argc, char **argv) |
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| 232 | { |
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| 233 | unsigned int pid; |
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| 234 | |
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| 235 | if (argc != 2) |
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| 236 | { |
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| 237 | printf(" usage: %s pid\n", argv[0]); |
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| 238 | return; |
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| 239 | } |
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| 240 | |
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| 241 | pid = atoi( argv[1] ); |
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| 242 | |
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| 243 | if( pid == 0 ) |
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| 244 | { |
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| 245 | printf(" error: ilegal pid format\n" ); |
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| 246 | } |
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| 247 | |
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| 248 | if( fg( pid ) ) |
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| 249 | { |
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| 250 | printf(" error: cannot find process %x\n", pid ); |
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| 251 | } |
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| 252 | } |
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| 253 | |
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[407] | 254 | ////////////////////////////////////////////// |
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| 255 | static void cmd_help( int argc , char **argv ) |
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[230] | 256 | { |
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[407] | 257 | unsigned int i; |
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[230] | 258 | |
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[407] | 259 | if (argc != 1) |
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| 260 | { |
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[409] | 261 | printf(" usage: %s\n", argv[0]); |
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[230] | 262 | return; |
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| 263 | } |
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| 264 | |
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| 265 | printf("available commands:\n"); |
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[407] | 266 | for (i = 0 ; cmd[i].name ; i++) |
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| 267 | { |
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[230] | 268 | printf("\t%s\t : %s\n", cmd[i].name , cmd[i].desc); |
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| 269 | } |
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[407] | 270 | } // end cmd_help() |
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[230] | 271 | |
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[407] | 272 | ////////////////////////////////////////////// |
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| 273 | static void cmd_kill( int argc , char **argv ) |
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[230] | 274 | { |
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[407] | 275 | unsigned int pid; |
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[230] | 276 | |
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[407] | 277 | if (argc != 2) |
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| 278 | { |
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[409] | 279 | printf(" usage: %s pid\n", argv[0]); |
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[230] | 280 | return; |
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| 281 | } |
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| 282 | |
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[427] | 283 | pid = atoi( argv[1] ); |
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[230] | 284 | |
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[427] | 285 | if( pid == 0 ) |
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| 286 | { |
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| 287 | printf(" error: ilegal pid format\n" ); |
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| 288 | } |
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| 289 | |
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[416] | 290 | if( kill( pid , SIGKILL ) ) |
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[407] | 291 | { |
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[409] | 292 | printf(" error: unable to kill process %x\n", pid ); |
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[230] | 293 | } |
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[407] | 294 | } // end cmd_kill() |
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[230] | 295 | |
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[407] | 296 | ////////////////////////////////////////////// |
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| 297 | static void cmd_load( int argc , char **argv ) |
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[230] | 298 | { |
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[427] | 299 | unsigned int ret_pid; |
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| 300 | unsigned int new_pid; |
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[408] | 301 | char * pathname; |
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[427] | 302 | unsigned int background; |
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[407] | 303 | |
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[427] | 304 | if( (argc < 2) || (argc > 3) ) |
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[407] | 305 | { |
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[427] | 306 | printf(" usage: %s pathname [&] \n", argv[0] ); |
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[407] | 307 | return; |
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| 308 | } |
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| 309 | |
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| 310 | pathname = argv[1]; |
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| 311 | |
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[427] | 312 | if( argc == 3 ) background = (argv[2][0] == '&'); |
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| 313 | |
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[407] | 314 | // fork system call |
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[427] | 315 | ret_pid = fork(); |
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[407] | 316 | |
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[427] | 317 | if (ret_pid == 0) // it is the child process |
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[407] | 318 | { |
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| 319 | // exec system call |
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[427] | 320 | if( exec( pathname , NULL , NULL ) ) |
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[409] | 321 | { |
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| 322 | printf(" error: new process unable to exec <%s>\n", pathname ); |
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| 323 | exit(0); |
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| 324 | } |
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[427] | 325 | |
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| 326 | // get new process pid |
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| 327 | new_pid = getpid(); |
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| 328 | |
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| 329 | // give new process terminal ownership |
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| 330 | if( background == 0 ) fg( new_pid ); |
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[407] | 331 | } |
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[427] | 332 | else if ( ret_pid < 0 ) // it is a failure reported to parent |
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[407] | 333 | { |
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[409] | 334 | printf(" error: unable to fork\n"); |
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[407] | 335 | } |
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| 336 | } // end cmd_load |
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| 337 | |
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| 338 | ///////////////////////////////////////////// |
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| 339 | static void cmd_log( int argc , char **argv ) |
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| 340 | { |
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| 341 | unsigned int i; |
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| 342 | |
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[230] | 343 | printf("--- registered commands ---\n"); |
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[407] | 344 | for (i = 0; i < LOG_DEPTH; i++) |
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| 345 | { |
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[230] | 346 | printf(" - %zu\t: %s\n", i, &log_entries[i].buf); |
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| 347 | } |
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| 348 | } |
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| 349 | |
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[407] | 350 | //////////////////////////////////////////// |
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| 351 | static void cmd_ls( int argc , char **argv ) |
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[230] | 352 | { |
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[407] | 353 | char * path; |
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[230] | 354 | |
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[407] | 355 | // struct dirent * file; |
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| 356 | // DIR *dir; |
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| 357 | |
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| 358 | if (argc == 1) |
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| 359 | { |
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[230] | 360 | path = "."; |
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[407] | 361 | } |
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| 362 | else if (argc == 2) |
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| 363 | { |
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[230] | 364 | path = argv[1]; |
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[407] | 365 | } |
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| 366 | else |
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| 367 | { |
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[409] | 368 | printf(" usage: ls [path]\n"); |
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[230] | 369 | return; |
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| 370 | } |
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| 371 | |
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[409] | 372 | printf(" error: not implemented yet\n"); |
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[407] | 373 | /* |
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| 374 | dir = opendir( path ); |
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[230] | 375 | while ((file = readdir(dir)) != NULL) |
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| 376 | { |
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| 377 | printf(" %s\n", file->d_name); |
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| 378 | } |
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| 379 | closedir(dir); |
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[407] | 380 | */ |
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[230] | 381 | } |
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| 382 | |
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[407] | 383 | /////////////////////////////////////////////// |
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| 384 | static void cmd_mkdir( int argc , char **argv ) |
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[230] | 385 | { |
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[407] | 386 | char * pathname; |
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[230] | 387 | |
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[407] | 388 | if (argc != 2) |
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| 389 | { |
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[409] | 390 | printf(" usage: mkdir pathname\n"); |
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[230] | 391 | return; |
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| 392 | } |
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| 393 | |
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[407] | 394 | pathname = argv[1]; |
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[230] | 395 | |
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[409] | 396 | printf(" error: not implemented yet\n"); |
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[407] | 397 | /* |
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| 398 | if ( mkdir( path, 0x700) == -1 ) |
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| 399 | { |
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[409] | 400 | printf(" error: cannot create directory %s\n", path); |
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[230] | 401 | } |
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[407] | 402 | */ |
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[230] | 403 | } |
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| 404 | |
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[407] | 405 | //////////////////////////////////////////// |
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| 406 | static void cmd_mv( int argc , char **argv ) |
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[230] | 407 | { |
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[407] | 408 | |
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[230] | 409 | if (argc < 3) |
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| 410 | { |
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| 411 | printf(" usage : %s src_pathname dst_pathname\n", argv[0]); |
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| 412 | return; |
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| 413 | } |
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| 414 | |
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[409] | 415 | printf(" error: not implemented yet\n"); |
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[407] | 416 | |
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| 417 | /* |
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[230] | 418 | int ret = giet_fat_rename(argv[1], argv[2]); |
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| 419 | if (ret < 0) |
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| 420 | { |
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[409] | 421 | printf(" error : cannot move %s to %s / err = %d\n", argv[1], argv[2], ret ); |
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[230] | 422 | } |
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[407] | 423 | */ |
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| 424 | |
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[230] | 425 | } |
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| 426 | |
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[407] | 427 | ///////////////////////////////////////////// |
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| 428 | static void cmd_pwd( int argc , char **argv ) |
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[230] | 429 | { |
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[407] | 430 | char buf[1024]; |
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[230] | 431 | |
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[407] | 432 | if (argc != 1) |
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| 433 | { |
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[409] | 434 | printf(" usage: pwd\n"); |
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[407] | 435 | return; |
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| 436 | } |
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| 437 | |
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| 438 | if ( getcwd( buf , 1024 ) ) |
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| 439 | { |
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[409] | 440 | printf(" error: unable to get current directory\n"); |
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[407] | 441 | } |
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| 442 | else |
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| 443 | { |
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| 444 | printf("%s\n", buf); |
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| 445 | } |
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| 446 | } |
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| 447 | |
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| 448 | //////////////////////////////////////////// |
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| 449 | static void cmd_rm( int argc , char **argv ) |
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| 450 | { |
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| 451 | char * pathname; |
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| 452 | |
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| 453 | if (argc != 2) |
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| 454 | { |
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[409] | 455 | printf(" usage: rm pathname\n"); |
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[230] | 456 | return; |
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| 457 | } |
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| 458 | |
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[407] | 459 | pathname = argv[1]; |
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[230] | 460 | |
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[409] | 461 | printf(" error: not implemented yet\n"); |
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[407] | 462 | /* |
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| 463 | if (remove(path) == -1) |
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| 464 | { |
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[409] | 465 | printf(" error: cannot remove %s\n", path); |
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[230] | 466 | } |
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[407] | 467 | */ |
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| 468 | |
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[230] | 469 | } |
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| 470 | |
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[407] | 471 | /////////////////////////////////////////////// |
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| 472 | static void cmd_rmdir( int argc , char **argv ) |
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[230] | 473 | { |
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| 474 | cmd_rm(argc, argv); |
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| 475 | } |
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| 476 | |
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[427] | 477 | ///////////////////////////////////////////////// |
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| 478 | static void cmd_display( int argc , char **argv ) |
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[230] | 479 | { |
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[427] | 480 | unsigned int cxy; |
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| 481 | unsigned int lid; |
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| 482 | unsigned int pid; |
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[230] | 483 | |
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[427] | 484 | if( strcmp( argv[1] , "vmm" ) == 0 ) |
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[407] | 485 | { |
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[427] | 486 | if( argc != 3 ) |
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| 487 | { |
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| 488 | printf(" usage: display vmm pid\n"); |
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| 489 | return; |
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| 490 | } |
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[230] | 491 | |
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[427] | 492 | pid = atoi(argv[2]); |
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[230] | 493 | |
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[427] | 494 | if( display_vmm( pid ) ) |
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| 495 | { |
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| 496 | printf(" error: illegal arguments pid = %x\n", pid ); |
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| 497 | } |
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| 498 | } |
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| 499 | else if( strcmp( argv[1] , "sched" ) == 0 ) |
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[407] | 500 | { |
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[427] | 501 | if( argc != 4 ) |
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| 502 | { |
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| 503 | printf(" usage: display sched cxy lid\n"); |
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| 504 | return; |
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| 505 | } |
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| 506 | |
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| 507 | cxy = atoi(argv[2]); |
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| 508 | lid = atoi(argv[3]); |
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| 509 | |
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| 510 | if( display_sched( cxy , lid ) ) |
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| 511 | { |
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| 512 | printf(" error: illegal arguments cxy = %x / lid = %d\n", cxy, lid ); |
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| 513 | } |
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[407] | 514 | } |
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[427] | 515 | else if( strcmp( argv[1] , "process" ) == 0 ) |
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| 516 | { |
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| 517 | if( argc != 3 ) |
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| 518 | { |
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| 519 | printf(" usage: display process cxy\n"); |
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| 520 | return; |
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| 521 | } |
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| 522 | |
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| 523 | cxy = atoi(argv[2]); |
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| 524 | |
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| 525 | if( display_process( cxy ) ) |
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| 526 | { |
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| 527 | printf(" error: illegal argument cxy = %x\n", cxy ); |
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| 528 | } |
---|
| 529 | } |
---|
| 530 | else if( strcmp( argv[1] , "vfs" ) == 0 ) |
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| 531 | { |
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| 532 | if( argc != 2 ) |
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| 533 | { |
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| 534 | printf(" usage: display vfs\n"); |
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| 535 | return; |
---|
| 536 | } |
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| 537 | |
---|
| 538 | display_vfs(); |
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| 539 | } |
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| 540 | else if( strcmp( argv[1] , "chdev" ) == 0 ) |
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| 541 | { |
---|
| 542 | if( argc != 2 ) |
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| 543 | { |
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| 544 | printf(" usage: display chdev\n"); |
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| 545 | return; |
---|
| 546 | } |
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| 547 | |
---|
| 548 | display_chdev(); |
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| 549 | } |
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| 550 | else |
---|
| 551 | { |
---|
| 552 | printf(" usage display (vmm/sched/process/vfs/chdev) [cxy] [lid]\n"); |
---|
| 553 | } |
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[230] | 554 | } |
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| 555 | |
---|
[407] | 556 | ////////////////////////////////////////////////////////////////// |
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| 557 | // Array of commands |
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| 558 | ////////////////////////////////////////////////////////////////// |
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[230] | 559 | |
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[407] | 560 | ksh_cmd_t cmd[] = |
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[230] | 561 | { |
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[427] | 562 | { "cat", "display file content", cmd_cat }, |
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| 563 | { "cd", "change current directory", cmd_cd }, |
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| 564 | { "cp", "replicate a file in file system", cmd_cp }, |
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| 565 | { "fg", "put a process in foreground", cmd_fg }, |
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| 566 | { "display", "display vmm/sched/process/vfs/chdev", cmd_display }, |
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| 567 | { "load", "load an user application", cmd_load }, |
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| 568 | { "help", "list available commands", cmd_help }, |
---|
| 569 | { "kill", "kill an application (all threads)", cmd_kill }, |
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| 570 | { "log", "list registered commands", cmd_log }, |
---|
| 571 | { "ls", "list directory entries", cmd_ls }, |
---|
| 572 | { "mkdir", "create a new directory", cmd_mkdir }, |
---|
| 573 | { "mv", "move a file in file system", cmd_mv }, |
---|
| 574 | { "pwd", "print current working directory", cmd_pwd }, |
---|
| 575 | { "rm", "remove a file from file system", cmd_rm }, |
---|
| 576 | { "rmdir", "remove a directory from file system", cmd_rmdir }, |
---|
| 577 | { NULL, NULL, NULL } |
---|
[230] | 578 | }; |
---|
| 579 | |
---|
[407] | 580 | //////////////////////////////////////////////////////////////////////////////////// |
---|
| 581 | // This function analyses one command (with arguments), execute it, and return. |
---|
| 582 | //////////////////////////////////////////////////////////////////////////////////// |
---|
[230] | 583 | static void parse(char *buf) |
---|
| 584 | { |
---|
| 585 | int argc = 0; |
---|
| 586 | char *argv[MAX_ARGS]; |
---|
| 587 | int i; |
---|
| 588 | int len = strlen(buf); |
---|
| 589 | |
---|
| 590 | // build argc/argv |
---|
[407] | 591 | for (i = 0; i < len; i++) |
---|
| 592 | { |
---|
| 593 | if (buf[i] == ' ') |
---|
| 594 | { |
---|
[230] | 595 | buf[i] = '\0'; |
---|
[407] | 596 | } |
---|
| 597 | else if (i == 0 || buf[i - 1] == '\0') |
---|
| 598 | { |
---|
| 599 | if (argc < MAX_ARGS) |
---|
| 600 | { |
---|
[230] | 601 | argv[argc] = &buf[i]; |
---|
| 602 | argc++; |
---|
| 603 | } |
---|
| 604 | } |
---|
| 605 | } |
---|
| 606 | |
---|
[407] | 607 | if (argc > 0) |
---|
| 608 | { |
---|
[230] | 609 | int found = 0; |
---|
| 610 | |
---|
| 611 | argv[argc] = NULL; |
---|
| 612 | |
---|
[407] | 613 | // try to match typed command |
---|
| 614 | for (i = 0; cmd[i].name; i++) |
---|
| 615 | { |
---|
| 616 | if (strcmp(argv[0], cmd[i].name) == 0) |
---|
| 617 | { |
---|
[230] | 618 | cmd[i].fn(argc, argv); |
---|
| 619 | found = 1; |
---|
| 620 | break; |
---|
| 621 | } |
---|
| 622 | } |
---|
| 623 | |
---|
[407] | 624 | if (!found) |
---|
| 625 | { |
---|
[230] | 626 | printf("\n undefined command %s\n", argv[0]); |
---|
| 627 | } |
---|
| 628 | } |
---|
| 629 | } |
---|
| 630 | |
---|
[407] | 631 | /////////////////////////////////// |
---|
| 632 | int main( int argc , char *argv[] ) |
---|
[230] | 633 | { |
---|
[407] | 634 | char c; // read character |
---|
| 635 | char buf[CMD_MAX_SIZE]; // buffer for one command |
---|
| 636 | unsigned int count = 0; // pointer in buf |
---|
| 637 | unsigned int i; // index for loops |
---|
[230] | 638 | |
---|
[407] | 639 | enum fsm_states |
---|
| 640 | { |
---|
[230] | 641 | NORMAL, |
---|
| 642 | ESCAPE, |
---|
| 643 | BRAKET, |
---|
| 644 | }; |
---|
| 645 | |
---|
[407] | 646 | // log buffer initialisation |
---|
| 647 | memset( &log_entries , 0, sizeof(log_entries)); |
---|
| 648 | ptw = 0; |
---|
| 649 | ptr = 0; |
---|
[230] | 650 | |
---|
| 651 | printf( "~~~ shell ~~~\n\n" ); |
---|
| 652 | |
---|
| 653 | // command buffer initialisation |
---|
[407] | 654 | memset( buf, 0x20 , sizeof(buf) ); |
---|
[230] | 655 | count = 0; |
---|
| 656 | |
---|
| 657 | // display first prompt |
---|
| 658 | printf("# "); |
---|
| 659 | |
---|
| 660 | // This lexical analyser writes one command line in the buf buffer. |
---|
| 661 | // It is implemented as a 3 states FSM to handle the following sequences: |
---|
| 662 | // - ESC [ A : up arrow |
---|
| 663 | // - ESC [ B : down arrow |
---|
| 664 | // - ESC [ C : right arrow |
---|
| 665 | // - ESC [ D : left arrow |
---|
[407] | 666 | // The three states have the following semantic: |
---|
[230] | 667 | // - NORMAL : no (ESC) character has been found |
---|
| 668 | // - ESCAPE : the character (ESC) has been found |
---|
| 669 | // - BRAKET : the wo characters (ESC,[) have been found |
---|
| 670 | unsigned int state = NORMAL; |
---|
| 671 | |
---|
[409] | 672 | |
---|
[407] | 673 | // @@@ |
---|
[416] | 674 | // parse("load /bin/user/sort.elf"); |
---|
[407] | 675 | // @@@ |
---|
[408] | 676 | |
---|
[407] | 677 | |
---|
[230] | 678 | while (1) |
---|
| 679 | { |
---|
[407] | 680 | c = (char)getchar(); |
---|
[230] | 681 | |
---|
[407] | 682 | if( c == 0 ) continue; |
---|
| 683 | |
---|
[230] | 684 | switch (state) |
---|
| 685 | { |
---|
| 686 | case NORMAL: |
---|
| 687 | { |
---|
| 688 | if ((c == '\b') || (c == 0x7F)) // backspace => remove one character |
---|
| 689 | { |
---|
| 690 | if (count > 0) { |
---|
| 691 | printf("\b \b"); |
---|
| 692 | count--; |
---|
| 693 | } |
---|
| 694 | } |
---|
| 695 | else if (c == '\n') // new line => call parser to execute command |
---|
| 696 | { |
---|
| 697 | if (count > 0) |
---|
| 698 | { |
---|
| 699 | // complete command |
---|
| 700 | buf[count] = '\0'; |
---|
| 701 | |
---|
| 702 | // register command in log arrays |
---|
| 703 | strcpy(log_entries[ptw].buf, buf); |
---|
| 704 | log_entries[ptw].count = count; |
---|
| 705 | ptw = (ptw + 1) % LOG_DEPTH; |
---|
| 706 | ptr = ptw; |
---|
| 707 | |
---|
| 708 | // execute command |
---|
| 709 | printf("\n"); |
---|
| 710 | parse((char *)&buf); |
---|
| 711 | |
---|
| 712 | // reinitialise buffer and display prompt |
---|
| 713 | for ( i = 0 ; i < sizeof(buf) ; i++ ) buf[i] = 0x20; |
---|
| 714 | count = 0; |
---|
| 715 | printf("# "); |
---|
| 716 | } |
---|
| 717 | } |
---|
| 718 | else if (c == '\t') // tabulation => do nothing |
---|
| 719 | { |
---|
| 720 | } |
---|
| 721 | else if (c == 0x1B) // ESC => start an escape sequence |
---|
| 722 | { |
---|
| 723 | state = ESCAPE; |
---|
| 724 | } |
---|
| 725 | else if (c == 0x03) // ^C => cancel current command |
---|
| 726 | { |
---|
| 727 | for (i = 0; i < count; i++) printf("\b \b"); |
---|
| 728 | for (i = 0; i < sizeof(buf); i++) buf[i] = 0x20; |
---|
| 729 | count = 0; |
---|
| 730 | } |
---|
| 731 | else // register character in command buffer |
---|
| 732 | { |
---|
| 733 | if (count < sizeof(buf) - 1) |
---|
| 734 | { |
---|
[418] | 735 | putchar( c ); |
---|
[230] | 736 | buf[count] = c; |
---|
| 737 | count++; |
---|
| 738 | } |
---|
| 739 | } |
---|
| 740 | break; |
---|
| 741 | } |
---|
| 742 | case ESCAPE: |
---|
| 743 | { |
---|
| 744 | if (c == '[') // valid sequence => continue |
---|
| 745 | { |
---|
| 746 | state = BRAKET; |
---|
| 747 | } |
---|
| 748 | else // invalid sequence => do nothing |
---|
| 749 | { |
---|
| 750 | state = NORMAL; |
---|
| 751 | } |
---|
| 752 | break; |
---|
| 753 | } |
---|
| 754 | case BRAKET: |
---|
| 755 | { |
---|
| 756 | if (c == 'D') // valid LEFT sequence => move buf pointer left |
---|
| 757 | { |
---|
| 758 | if (count > 0) |
---|
| 759 | { |
---|
| 760 | printf("\b"); |
---|
| 761 | count--; |
---|
| 762 | } |
---|
| 763 | |
---|
| 764 | // get next user char |
---|
| 765 | state = NORMAL; |
---|
| 766 | } |
---|
| 767 | else if (c == 'C') // valid RIGHT sequence => move buf pointer right |
---|
| 768 | { |
---|
| 769 | if (count < sizeof(buf) - 1) |
---|
| 770 | { |
---|
| 771 | printf("%c", buf[count]); |
---|
| 772 | count++; |
---|
| 773 | } |
---|
| 774 | |
---|
| 775 | // get next user char |
---|
| 776 | state = NORMAL; |
---|
| 777 | } |
---|
| 778 | else if (c == 'A') // valid UP sequence => move log pointer backward |
---|
| 779 | { |
---|
| 780 | // cancel current command |
---|
| 781 | for (i = 0; i < count; i++) printf("\b \b"); |
---|
| 782 | count = 0; |
---|
| 783 | |
---|
| 784 | // copy log command into buf |
---|
| 785 | ptr = (ptr - 1) % LOG_DEPTH; |
---|
| 786 | strcpy(buf, log_entries[ptr].buf); |
---|
| 787 | count = log_entries[ptr].count; |
---|
| 788 | |
---|
| 789 | // display log command |
---|
| 790 | printf("%s", buf); |
---|
| 791 | |
---|
| 792 | // get next user char |
---|
| 793 | state = NORMAL; |
---|
| 794 | } |
---|
| 795 | else if (c == 'B') // valid DOWN sequence => move log pointer forward |
---|
| 796 | { |
---|
| 797 | // cancel current command |
---|
| 798 | for (i = 0 ; i < count; i++) printf("\b \b"); |
---|
| 799 | count = 0; |
---|
| 800 | |
---|
| 801 | // copy log command into buf |
---|
| 802 | ptr = (ptr + 1) % LOG_DEPTH; |
---|
| 803 | strcpy(buf, log_entries[ptr].buf); |
---|
| 804 | count = log_entries[ptr].count; |
---|
| 805 | |
---|
| 806 | // display log command |
---|
| 807 | printf("%s", buf); |
---|
| 808 | |
---|
| 809 | // get next user char |
---|
| 810 | state = NORMAL; |
---|
| 811 | } |
---|
| 812 | else // other character => do nothing |
---|
| 813 | { |
---|
| 814 | // get next user char |
---|
| 815 | state = NORMAL; |
---|
| 816 | } |
---|
| 817 | break; |
---|
| 818 | } |
---|
| 819 | } |
---|
| 820 | } |
---|
| 821 | } |
---|
| 822 | |
---|