diplodocus.org Git - nmh/blob - sbr/smatch.c

   1 /* smatch.c -- match a switch (option)
   2  *
   3  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   4  * COPYRIGHT file in the root directory of the nmh distribution for
   5  * complete copyright information.
   6  */
   7
   8 #include <h/mh.h>
   9
  10
  11 int
  12 smatch(const char *string, const struct swit *swp)
  13 {
  14     const char *sp, *tcp;
  15     int firstone, len;
  16     const struct swit *tp;
  17
  18     firstone = UNKWNSW;
  19
  20     if (!string)
  21         return firstone;
  22     len = strlen(string);
  23
  24     for (tp = swp; tp->sw; tp++) {
  25         tcp = tp->sw;
  26         if (len < abs(tp->minchars))
  27             continue;                   /* no match */
  28         for (sp = string; *sp == *tcp++;) {
  29             if (*sp++ == '\0')
  30                 return tp->swret;       /* exact match */
  31         }
  32         if (*sp) {
  33             if (*sp != ' ')
  34                 continue;               /* no match */
  35             if (*--tcp == '\0')
  36                 return tp->swret;       /* exact match */
  37         }
  38         if (firstone == UNKWNSW)
  39             firstone = tp->swret;
  40         else
  41             firstone = AMBIGSW;
  42     }
  43
  44     return firstone;
  45 }