nsz Git - musl/blob - src/misc/getopt_long.c

   1 #define _GNU_SOURCE
   2 #include <stddef.h>
   3 #include <getopt.h>
   4 #include <stdio.h>
   5
   6 extern int __optpos, __optreset;
   7
   8 static void permute(char *const *argv, int dest, int src)
   9 {
  10         char **av = (char **)argv;
  11         char *tmp = av[src];
  12         int i;
  13         for (i=src; i>dest; i--)
  14                 av[i] = av[i-1];
  15         av[dest] = tmp;
  16 }
  17
  18 static int __getopt_long_core(int argc, char *const *argv, const char *optstring, const struct option *longopts, int *idx, int longonly);
  19
  20 static int __getopt_long(int argc, char *const *argv, const char *optstring, const struct option *longopts, int *idx, int longonly)
  21 {
  22         int ret, skipped, resumed;
  23         if (!optind || __optreset) {
  24                 __optreset = 0;
  25                 __optpos = 0;
  26                 optind = 1;
  27         }
  28         if (optind >= argc || !argv[optind]) return -1;
  29         skipped = optind;
  30         if (optstring[0] != '+' && optstring[0] != '-') {
  31                 int i;
  32                 for (i=optind; ; i++) {
  33                         if (i >= argc || !argv[i]) return -1;
  34                         if (argv[i][0] != '-') continue;
  35                         if (!argv[i][1]) continue;
  36                         break;
  37                 }
  38                 optind = i;
  39         }
  40         resumed = optind;
  41         ret = __getopt_long_core(argc, argv, optstring, longopts, idx, longonly);
  42         if (resumed > skipped) {
  43                 int i, cnt = optind-resumed;
  44                 for (i=0; i<cnt; i++)
  45                         permute(argv, skipped, optind-1);
  46                 optind = skipped + cnt;
  47         }
  48         return ret;
  49 }
  50
  51 static int __getopt_long_core(int argc, char *const *argv, const char *optstring, const struct option *longopts, int *idx, int longonly)
  52 {
  53
  54         if (longopts && argv[optind][0] == '-' &&
  55                 ((longonly && argv[optind][1]) ||
  56                  (argv[optind][1] == '-' && argv[optind][2])))
  57         {
  58                 int i, cnt, match;
  59                 char *opt;
  60                 for (cnt=i=0; longopts[i].name; i++) {
  61                         const char *name = longopts[i].name;
  62                         opt = argv[optind]+1;
  63                         if (*opt == '-') opt++;
  64                         for (; *name && *name == *opt; name++, opt++);
  65                         if (*opt && *opt != '=') continue;
  66                         match = i;
  67                         if (!*name) {
  68                                 cnt = 1;
  69                                 break;
  70                         }
  71                         cnt++;
  72                 }
  73                 if (cnt==1) {
  74                         i = match;
  75                         optind++;
  76                         if (*opt == '=') {
  77                                 if (!longopts[i].has_arg) return '?';
  78                                 optarg = opt+1;
  79                         } else {
  80                                 if (longopts[i].has_arg == required_argument) {
  81                                         if (!(optarg = argv[optind]))
  82                                                 return ':';
  83                                         optind++;
  84                                 } else optarg = NULL;
  85                         }
  86                         if (idx) *idx = i;
  87                         if (longopts[i].flag) {
  88                                 *longopts[i].flag = longopts[i].val;
  89                                 return 0;
  90                         }
  91                         return longopts[i].val;
  92                 }
  93                 if (argv[optind][1] == '-') {
  94                         optind++;
  95                         return '?';
  96                 }
  97         }
  98         return getopt(argc, argv, optstring);
  99 }
 100
 101 int getopt_long(int argc, char *const *argv, const char *optstring, const struct option *longopts, int *idx)
 102 {
 103         return __getopt_long(argc, argv, optstring, longopts, idx, 0);
 104 }
 105
 106 int getopt_long_only(int argc, char *const *argv, const char *optstring, const struct option *longopts, int *idx)
 107 {
 108         return __getopt_long(argc, argv, optstring, longopts, idx, 1);
 109 }