src/misc/getopt_long.c

   1 #define _GNU_SOURCE
   2 #include <stddef.h>
   3 #include <stdlib.h>
   4 #include <limits.h>
   5 #include <getopt.h>
   6 #include <stdio.h>
   7 #include <string.h>
   8 #include "stdio_impl.h"
   9
  10 extern int __optpos, __optreset;
  11
  12 static void permute(char *const *argv, int dest, int src)
  13 {
  14         char **av = (char **)argv;
  15         char *tmp = av[src];
  16         int i;
  17         for (i=src; i>dest; i--)
  18                 av[i] = av[i-1];
  19         av[dest] = tmp;
  20 }
  21
  22 static int __getopt_long_core(int argc, char *const *argv, const char *optstring, const struct option *longopts, int *idx, int longonly);
  23
  24 static int __getopt_long(int argc, char *const *argv, const char *optstring, const struct option *longopts, int *idx, int longonly)
  25 {
  26         int ret, skipped, resumed;
  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         }
  42         resumed = optind;
  43         ret = __getopt_long_core(argc, argv, optstring, longopts, idx, longonly);
  44         if (resumed > skipped) {
  45                 int i, cnt = optind-resumed;
  46                 for (i=0; i<cnt; i++)
  47                         permute(argv, skipped, optind-1);
  48                 optind = skipped + cnt;
  49         }
  50         return ret;
  51 }
  52
  53 static int __getopt_long_core(int argc, char *const *argv, const char *optstring, const struct option *longopts, int *idx, int longonly)
  54 {
  55         optarg = 0;
  56         if (longopts && argv[optind][0] == '-' &&
  57                 ((longonly && argv[optind][1] && argv[optind][1] != '-') ||
  58                  (argv[optind][1] == '-' && argv[optind][2])))
  59         {
  60                 int colon = optstring[optstring[0]=='+'||optstring[0]=='-']==':';
  61                 int i, cnt, match;
  62                 char *arg, *opt, *start = argv[optind]+1;
  63                 for (cnt=i=0; longopts[i].name; i++) {
  64                         const char *name = longopts[i].name;
  65                         opt = start;
  66                         if (*opt == '-') opt++;
  67                         while (*opt && *opt != '=' && *opt == *name)
  68                                 name++, opt++;
  69                         if (*opt && *opt != '=') continue;
  70                         arg = opt;
  71                         match = i;
  72                         if (!*name) {
  73                                 cnt = 1;
  74                                 break;
  75                         }
  76                         cnt++;
  77                 }
  78                 if (cnt==1 && longonly && arg-start == mblen(start, MB_LEN_MAX)) {
  79                         int l = arg-start;
  80                         for (i=0; optstring[i]; i++) {
  81                                 int j;
  82                                 for (j=0; j<l && start[j]==optstring[i+j]; j++);
  83                                 if (j==l) {
  84                                         cnt++;
  85                                         break;
  86                                 }
  87                         }
  88                 }
  89                 if (cnt==1) {
  90                         i = match;
  91                         opt = arg;
  92                         optind++;
  93                         if (*opt == '=') {
  94                                 if (!longopts[i].has_arg) {
  95                                         optopt = longopts[i].val;
  96                                         if (colon || !opterr)
  97                                                 return '?';
  98                                         __getopt_msg(argv[0],
  99                                                 ": option does not take an argument: ",
 100                                                 longopts[i].name,
 101                                                 strlen(longopts[i].name));
 102                                         return '?';
 103                                 }
 104                                 optarg = opt+1;
 105                         } else if (longopts[i].has_arg == required_argument) {
 106                                 if (!(optarg = argv[optind])) {
 107                                         optopt = longopts[i].val;
 108                                         if (colon) return ':';
 109                                         if (!opterr) return '?';
 110                                         __getopt_msg(argv[0],
 111                                                 ": option requires an argument: ",
 112                                                 longopts[i].name,
 113                                                 strlen(longopts[i].name));
 114                                         return '?';
 115                                 }
 116                                 optind++;
 117                         }
 118                         if (idx) *idx = i;
 119                         if (longopts[i].flag) {
 120                                 *longopts[i].flag = longopts[i].val;
 121                                 return 0;
 122                         }
 123                         return longopts[i].val;
 124                 }
 125                 if (argv[optind][1] == '-') {
 126                         optopt = 0;
 127                         if (!colon && opterr)
 128                                 __getopt_msg(argv[0], cnt ?
 129                                         ": option is ambiguous: " :
 130                                         ": unrecognized option: ",
 131                                         argv[optind]+2,
 132                                         strlen(argv[optind]+2));
 133                         optind++;
 134                         return '?';
 135                 }
 136         }
 137         return getopt(argc, argv, optstring);
 138 }
 139
 140 int getopt_long(int argc, char *const *argv, const char *optstring, const struct option *longopts, int *idx)
 141 {
 142         return __getopt_long(argc, argv, optstring, longopts, idx, 0);
 143 }
 144
 145 int getopt_long_only(int argc, char *const *argv, const char *optstring, const struct option *longopts, int *idx)
 146 {
 147         return __getopt_long(argc, argv, optstring, longopts, idx, 1);
 148 }