1 | #include <string.h> |
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2 | #include <getopt.h> |
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3 | |
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4 | static void getopterror(int which) { |
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5 | static char error1[]="Unknown option `-x'.\n"; |
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6 | static char error2[]="Missing argument for `-x'.\n"; |
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7 | if (opterr) { |
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8 | if (which) { |
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9 | error2[23]=optopt; |
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10 | write(2,error2,28); |
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11 | } else { |
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12 | error1[17]=optopt; |
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13 | write(2,error1,22); |
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14 | } |
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15 | } |
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16 | } |
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17 | |
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18 | int getopt_long_only(int argc, char * const argv[], const char *optstring, |
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19 | const struct option *longopts, int *longindex) { |
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20 | static int lastidx,lastofs; |
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21 | char *tmp,*arg; |
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22 | if (optind==0) { optind=1; lastidx=0; } /* whoever started setting optind to 0 should be shot */ |
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23 | again: |
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24 | if (optind>argc || !argv[optind] || *argv[optind]!='-' || argv[optind][1]==0) |
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25 | return -1; |
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26 | if (argv[optind][1]=='-' && argv[optind][2]==0) { |
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27 | ++optind; |
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28 | return -1; |
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29 | } |
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30 | if (argv[optind][1]=='-') |
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31 | arg=argv[optind]+2; |
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32 | else |
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33 | arg=argv[optind]+1; |
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34 | { |
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35 | char* max=strchr(arg,'='); |
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36 | const struct option* o; |
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37 | const struct option* match=0; |
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38 | if (!max) max=arg+strlen(arg); |
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39 | for (o=longopts; o->name; ++o) { |
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40 | size_t tlen=max-arg; |
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41 | if (!strncmp(o->name,arg,tlen)) { /* match */ |
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42 | if (strlen(o->name)==tlen) { |
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43 | match=o; /* perfect match, not just prefix */ |
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44 | break; |
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45 | } |
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46 | if (!match) |
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47 | match=o; |
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48 | else |
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49 | /* Another imperfect match. */ |
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50 | match=(struct option*)-1; |
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51 | } |
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52 | } |
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53 | if (match!=(struct option*)-1 && (o=match)) { |
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54 | if (longindex) *longindex=o-longopts; |
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55 | if (o->has_arg>0) { |
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56 | if (*max=='=') |
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57 | optarg=max+1; |
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58 | else { |
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59 | optarg=argv[optind+1]; |
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60 | if (!optarg && o->has_arg==1) { /* no argument there */ |
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61 | if (*optstring==':') return ':'; |
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62 | write(2,"argument required: `",20); |
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63 | write(2,arg,(size_t)(max-arg)); |
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64 | write(2,"'.\n",3); |
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65 | ++optind; |
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66 | return '?'; |
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67 | } |
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68 | ++optind; |
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69 | } |
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70 | } |
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71 | ++optind; |
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72 | if (o->flag) |
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73 | *(o->flag)=o->val; |
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74 | else |
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75 | return o->val; |
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76 | return 0; |
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77 | } |
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78 | if (argv[optind][1]!='-') goto shortopt; |
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79 | if (*optstring==':') return ':'; |
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80 | write(2,"invalid option `",16); |
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81 | write(2,arg,(size_t)(max-arg)); |
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82 | write(2,"'.\n",3); |
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83 | ++optind; |
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84 | return '?'; |
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85 | } |
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86 | shortopt: |
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87 | if (lastidx!=optind) { |
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88 | lastidx=optind; lastofs=0; |
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89 | } |
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90 | optopt=argv[optind][lastofs+1]; |
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91 | if ((tmp=strchr(optstring,optopt))) { |
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92 | if (*tmp==0) { /* apparently, we looked for \0, i.e. end of argument */ |
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93 | ++optind; |
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94 | goto again; |
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95 | } |
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96 | if (tmp[1]==':') { /* argument expected */ |
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97 | if (tmp[2]==':' || argv[optind][lastofs+2]) { /* "-foo", return "oo" as optarg */ |
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98 | if (!*(optarg=argv[optind]+lastofs+2)) optarg=0; |
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99 | goto found; |
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100 | } |
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101 | optarg=argv[optind+1]; |
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102 | if (!optarg) { /* missing argument */ |
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103 | ++optind; |
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104 | if (*optstring==':') return ':'; |
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105 | getopterror(1); |
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106 | return ':'; |
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107 | } |
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108 | ++optind; |
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109 | } else { |
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110 | ++lastofs; |
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111 | return optopt; |
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112 | } |
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113 | found: |
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114 | ++optind; |
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115 | return optopt; |
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116 | } else { /* not found */ |
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117 | getopterror(0); |
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118 | ++optind; |
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119 | return '?'; |
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120 | } |
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121 | } |
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