idlc/source/preproc/getopt.c

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  30
  31 #include        <stdio.h>
  32 #include    <string.h>
  33
  34 #define EPR                 fprintf(stderr,
  35 #define ERR(str, chr)       if(opterr) { EPR "%s%c\n", str, chr); }
  36
  37 int opterr = 1;
  38 int optind = 1;
  39 int optopt;
  40 char *optarg;
  41
  42 int
  43     cppgetopt(int argc, char *const argv[], const char *opts)
  44 {
  45     static int sp = 1;
  46     register int c;
  47     register char *cp;
  48
  49     if (sp == 1)
  50     {
  51         if (optind >= argc ||
  52             argv[optind][0] != '-' || argv[optind][1] == '\0')
  53             return -1;
  54         else
  55             if (strcmp(argv[optind], "--") == 0)
  56             {
  57                 optind++;
  58                 return -1;
  59             }
  60     }
  61     optopt = c = argv[optind][sp];
  62     if (c == ':' || (cp = strchr(opts, c)) == 0)
  63     {
  64         ERR(": illegal option -- ", c);
  65         if (argv[optind][++sp] == '\0')
  66         {
  67             optind++;
  68             sp = 1;
  69         }
  70         return '?';
  71     }
  72     if (*++cp == ':')
  73     {
  74         if (argv[optind][sp + 1] != '\0')
  75             optarg = &argv[optind++][sp + 1];
  76         else
  77             if (++optind >= argc)
  78             {
  79                 ERR(": option requires an argument -- ", c);
  80                 sp = 1;
  81                 return '?';
  82             }
  83             else
  84                 optarg = argv[optind++];
  85         sp = 1;
  86     }
  87     else
  88     {
  89         if (argv[optind][++sp] == '\0')
  90         {
  91             sp = 1;
  92             optind++;
  93         }
  94         optarg = 0;
  95     }
  96     return c;
  97 }