stricstr.c

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#include <string.h>
#include <ctype.h>
#include "FBLib_string.h"
 
extern int strncasecmp(__const char *__s1, __const char *__s2, size_t __n);
 
// case-insensitive version of strstr()
char *stricstr(const char *s1, const char *s2)
{
  TRACEENTER();
 
  bool found = FALSE;
  char start[3];
  char *str = NULL;
 
  if(!s1 || !s2)
  {
    TRACEEXIT();
    return NULL;
  }
 
  s1 = SkipCharTableBytes(s1);
  s2 = SkipCharTableBytes(s2);
 
  if(*s2)
  {
    size_t len = strlen(s2) - 1;
 
    start[0] = toupper(*s2);
    start[1] = tolower(*s2);
    start[2] = '\0';
 
    s2++;
 
    do
    {
      if((str = strpbrk(s1, start)))
      {
        s1 = str + 1;
        found = (strncasecmp(s1, s2, len) == 0);
      }
    }
    while(str && !found && *s1);
  }
 
  TRACEEXIT();
  return (found ? str : NULL);
}