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 #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         const char *optstring2 = optstring + 1;
  27         if (!optind || __optreset) {
  28                 __optreset = 0;
  29                 __optpos = 0;
  30                 optind = 1;
  31         }
  32         if (optind >= argc || !argv[optind]) return -1;
  33         skipped = optind;
  34         if (optstring[0] != '+' && optstring[0] != '-') {
  35                 int i;
  36                 for (i=optind; ; i++) {
  37                         if (i >= argc || !argv[i]) return -1;
  38                         if (argv[i][0] == '-' && argv[i][1]) break;
  39                 }
  40                 optind = i;
  41                 optstring2 = optstring;
  42         }
  43         resumed = optind;
  44         ret = __getopt_long_core(argc, argv, optstring2, longopts, idx, longonly);
  45         if (resumed > skipped) {
  46                 int i, cnt = optind-resumed;
  47                 for (i=0; i<cnt; i++)
  48                         permute(argv, skipped, optind-1);
  49                 optind = skipped + cnt;
  50         }
  51         return ret;
  52 }
  53
  54 static int __getopt_long_core(int argc, char *const *argv, const char *optstring, const struct option *longopts, int *idx, int longonly)
  55 {
  56
  57         if (longopts && argv[optind][0] == '-' &&
  58                 ((longonly && argv[optind][1]) ||
  59                  (argv[optind][1] == '-' && argv[optind][2])))
  60         {
  61                 int i, cnt, match;
  62                 char *opt;
  63                 for (cnt=i=0; longopts[i].name; i++) {
  64                         const char *name = longopts[i].name;
  65                         opt = argv[optind]+1;
  66                         if (*opt == '-') opt++;
  67                         for (; *name && *name == *opt; name++, opt++);
  68                         if (*opt && *opt != '=') continue;
  69                         match = i;
  70                         if (!*name) {
  71                                 cnt = 1;
  72                                 break;
  73                         }
  74                         cnt++;
  75                 }
  76                 if (cnt==1) {
  77                         i = match;
  78                         optind++;
  79                         optopt = longopts[i].val;
  80                         if (*opt == '=') {
  81                                 if (!longopts[i].has_arg) {
  82                                         if (optstring[0] == ':' || !opterr)
  83                                                 return '?';
  84                                         __getopt_msg(argv[0],
  85                                                 ": option does not take an argument: ",
  86                                                 longopts[i].name,
  87                                                 strlen(longopts[i].name));
  88                                         return '?';
  89                                 }
  90                                 optarg = opt+1;
  91                         } else {
  92                                 if (longopts[i].has_arg == required_argument) {
  93                                         if (!(optarg = argv[optind])) {
  94                                                 if (optstring[0] == ':' || !opterr)
  95                                                         return ':';
  96                                                 __getopt_msg(argv[0],
  97                                                         ": option requires an argument: ",
  98                                                         longopts[i].name,
  99                                                         strlen(longopts[i].name));
 100                                                 return '?';
 101                                         }
 102                                         optind++;
 103                                 } else optarg = NULL;
 104                         }
 105                         if (idx) *idx = i;
 106                         if (longopts[i].flag) {
 107                                 *longopts[i].flag = longopts[i].val;
 108                                 return 0;
 109                         }
 110                         return longopts[i].val;
 111                 }
 112                 if (argv[optind][1] == '-') {
 113                         if (optstring[0] != ':' && opterr)
 114                                 __getopt_msg(argv[0], cnt ?
 115                                         ": option is ambiguous: " :
 116                                         ": unrecognized option: ",
 117                                         argv[optind]+2,
 118                                         strlen(argv[optind]+2));
 119                         optind++;
 120                         return '?';
 121                 }
 122         }
 123         return getopt(argc, argv, optstring);
 124 }
 125
 126 int getopt_long(int argc, char *const *argv, const char *optstring, const struct option *longopts, int *idx)
 127 {
 128         return __getopt_long(argc, argv, optstring, longopts, idx, 0);
 129 }
 130
 131 int getopt_long_only(int argc, char *const *argv, const char *optstring, const struct option *longopts, int *idx)
 132 {
 133         return __getopt_long(argc, argv, optstring, longopts, idx, 1);
 134 }