soltools/cpp/_getopt.c

   1 #include    <stdio.h>
   2 #include    <string.h>
   3
   4 #define EPR                 fprintf(stderr,
   5 #define ERR(str, chr)       if(opterr) { EPR "%s%c\n", str, chr); }
   6
   7 int opterr = 1;
   8 int optind = 1;
   9 int optopt;
  10 char *optarg;
  11
  12 int
  13     stgetopt(int argc, char *const argv[], const char *opts)
  14 {
  15     static int sp = 1;
  16     register int c;
  17     register char *cp;
  18
  19     if (sp == 1)
  20     {
  21         if (optind >= argc ||
  22             argv[optind][0] != '-' || argv[optind][1] == '\0')
  23             return -1;
  24         else if (strcmp(argv[optind], "--") == 0)
  25             {
  26                 optind++;
  27                 return -1;
  28             }
  29         else if (strcmp(argv[optind], "-isysroot") == 0)
  30             {
  31                 // skip Mac OS X SDK selection flags
  32                 optind++; optind++;
  33             }
  34     }
  35     optopt = c = argv[optind][sp];
  36     if (c == ':' || (cp = strchr(opts, c)) == 0)
  37     {
  38         ERR(": illegal option -- ", c);
  39         if (argv[optind][++sp] == '\0')
  40         {
  41             optind++;
  42             sp = 1;
  43         }
  44         return '?';
  45     }
  46     if (*++cp == ':')
  47     {
  48         if (argv[optind][sp + 1] != '\0')
  49             optarg = &argv[optind++][sp + 1];
  50         else
  51             if (++optind >= argc)
  52             {
  53                 ERR(": option requires an argument -- ", c);
  54                 sp = 1;
  55                 return '?';
  56             }
  57             else
  58                 optarg = argv[optind++];
  59         sp = 1;
  60     }
  61     else
  62     {
  63         if (argv[optind][++sp] == '\0')
  64         {
  65             sp = 1;
  66             optind++;
  67         }
  68         optarg = 0;
  69     }
  70     return c;
  71 }