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#include <ctype.h>
char *trim (char *str)
{
   char *ibuf, *obuf;
 
   if (str)
   {
      for (ibuf = obuf = str; *ibuf;)
      {
         while (*ibuf && (isspace (*ibuf)))
            ibuf++;
         if (*ibuf && (obuf != str))
            *(obuf++) = ' ';
         while (*ibuf && (!isspace (*ibuf)))
            *(obuf++) = *(ibuf++);
      }
      *obuf = '\0';
   }
   return (str);
}
 
#ifdef TEST
#include <stdio.h>
#include <string.h>
 
#define NB(a) (sizeof (a)/sizeof*(a))
 
int main (void)
{
   typedef struct
   {
      char const *sin;
      char const *sout;
   }
   test_s;
 
/*
 * ben la fonction trim, d'habitude, supprime les 
 * espaces a gauche et a droite d'une chaine passee 
 * en parametre! 
 */
   static test_s const a[] =
   {
      {NULL, NULL},
      {"", ""},
      {" a", "a"},
      {"a ", "a"},
      {"    a", "a"},
      {"a    ", "a"},
      {" a b", "a b"},
      {" a b ", "a b"},
   };
   size_t i;
 
   for (i = 0; i < NB (a); i++)
   {
      test_s const *p = a + i;
 
      if (p->sin == NULL)
      {
         char *sout = trim (NULL);
         if (sout != NULL)
         {
            printf ("ERR at test %u\n", i + 1);
            break;
         }
      }
      else
      {
         char sin[32];
 
         strcpy (sin, p->sin);
 
         {
            char *sout = trim (sin);
 
            if (strcmp (sout, p->sout) != 0)
            {
               printf ("ERR at test %u\n", i + 1);
               break;
            }
         }
      }
   }
 
   if (i == NB (a))
   {
      puts ("PASSED");
   }
   return 0;
}
 
#endif | 
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