src/misc/getopt_long.c

   1 #define _GNU_SOURCE
   2 #include <stddef.h>
   3 #include <getopt.h>
   4 #include <stdio.h>
   5 #include <string.h>
   6
   7 extern int __optpos, __optreset;
   8
   9 static void permute(char *const *argv, int dest, int src)
  10 {
  11         char **av = (char **)argv;
  12         char *tmp = av[src];
  13         int i;
  14         for (i=src; i>dest; i--)
  15                 av[i] = av[i-1];
  16         av[dest] = tmp;
  17 }
  18
  19 void __getopt_msg(const char *, const char *, const char *, size_t);
  20
  21 static int __getopt_long_core(int argc, char *const *argv, const char *optstring, const struct option *longopts, int *idx, int longonly);
  22
  23 static int __getopt_long(int argc, char *const *argv, const char *optstring, const struct option *longopts, int *idx, int longonly)
  24 {
  25         int ret, skipped, resumed;
  26         if (!optind || __optreset) {
  27                 __optreset = 0;
  28                 __optpos = 0;
  29                 optind = 1;
  30         }
  31         if (optind >= argc || !argv[optind]) return -1;
  32         skipped = optind;
  33         if (optstring[0] != '+' && optstring[0] != '-') {
  34                 int i;
  35                 for (i=optind; ; i++) {
  36                         if (i >= argc || !argv[i]) return -1;
  37                         if (argv[i][0] == '-' && argv[i][1]) break;
  38                 }
  39                 optind = i;
  40         }
  41         resumed = optind;
  42         ret = __getopt_long_core(argc, argv, optstring, longopts, idx, longonly);
  43         if (resumed > skipped) {
  44                 int i, cnt = optind-resumed;
  45                 for (i=0; i<cnt; i++)
  46                         permute(argv, skipped, optind-1);
  47                 optind = skipped + cnt;
  48         }
  49         return ret;
  50 }
  51
  52 static int __getopt_long_core(int argc, char *const *argv, const char *optstring, const struct option *longopts, int *idx, int longonly)
  53 {
  54         optarg = 0;
  55         if (longopts && argv[optind][0] == '-' &&
  56                 ((longonly && argv[optind][1] && argv[optind][1] != '-') ||
  57                  (argv[optind][1] == '-' && argv[optind][2])))
  58         {
  59                 int colon = optstring[optstring[0]=='+'||optstring[0]=='-']==':';
  60                 int i, cnt, match;
  61                 char *opt;
  62                 for (cnt=i=0; longopts[i].name; i++) {
  63                         const char *name = longopts[i].name;
  64                         opt = argv[optind]+1;
  65                         if (*opt == '-') opt++;
  66                         for (; *name && *name == *opt; name++, opt++);
  67                         if (*opt && *opt != '=') continue;
  68                         match = i;
  69                         if (!*name) {
  70                                 cnt = 1;
  71                                 break;
  72                         }
  73                         cnt++;
  74                 }
  75                 if (cnt==1) {
  76                         i = match;
  77                         optind++;
  78                         if (*opt == '=') {
  79                                 if (!longopts[i].has_arg) {
  80                                         optopt = longopts[i].val;
  81                                         if (colon || !opterr)
  82                                                 return '?';
  83                                         __getopt_msg(argv[0],
  84                                                 ": option does not take an argument: ",
  85                                                 longopts[i].name,
  86                                                 strlen(longopts[i].name));
  87                                         return '?';
  88                                 }
  89                                 optarg = opt+1;
  90                         } else if (longopts[i].has_arg == required_argument) {
  91                                 if (!(optarg = argv[optind])) {
  92                                         optopt = longopts[i].val;
  93                                         if (colon) return ':';
  94                                         if (!opterr) return '?';
  95                                         __getopt_msg(argv[0],
  96                                                 ": option requires an argument: ",
  97                                                 longopts[i].name,
  98                                                 strlen(longopts[i].name));
  99                                         return '?';
 100                                 }
 101                                 optind++;
 102                         }
 103                         if (idx) *idx = i;
 104                         if (longopts[i].flag) {
 105                                 *longopts[i].flag = longopts[i].val;
 106                                 return 0;
 107                         }
 108                         return longopts[i].val;
 109                 }
 110                 if (argv[optind][1] == '-') {
 111                         optopt = 0;
 112                         if (!colon && opterr)
 113                                 __getopt_msg(argv[0], cnt ?
 114                                         ": option is ambiguous: " :
 115                                         ": unrecognized option: ",
 116                                         argv[optind]+2,
 117                                         strlen(argv[optind]+2));
 118                         optind++;
 119                         return '?';
 120                 }
 121         }
 122         return getopt(argc, argv, optstring);
 123 }
 124
 125 int getopt_long(int argc, char *const *argv, const char *optstring, const struct option *longopts, int *idx)
 126 {
 127         return __getopt_long(argc, argv, optstring, longopts, idx, 0);
 128 }
 129
 130 int getopt_long_only(int argc, char *const *argv, const char *optstring, const struct option *longopts, int *idx)
 131 {
 132         return __getopt_long(argc, argv, optstring, longopts, idx, 1);
 133 }