1  /*
       2   * strchr --- search a string for a character
       3   *
       4   * We supply this routine for those systems that aren't standard yet.
       5   */
       6  
       7  #if 0
       8  #include <stdio.h>
       9  #endif
      10  
      11  char *
      12  strchr(str, c)
      13  const char *str, c;
      14  {
      15  	if (c == '\0') {
      16  		/* thanks to Mike Brennan ... */
      17  		do {
      18  			if (*str == c)
      19  				return (char *) str;
      20  		} while (*str++);
      21  	} else {
      22  		for (; *str; str++)
      23  			if (*str == c)
      24  				return (char *) str;
      25  	}
      26  
      27  	return NULL;
      28  }
      29  
      30  /*
      31   * strrchr --- find the last occurrence of a character in a string
      32   *
      33   * We supply this routine for those systems that aren't standard yet.
      34   */
      35  
      36  char *
      37  strrchr(str, c)
      38  const char *str, c;
      39  {
      40  	const char *save = NULL;
      41  
      42  	for (; *str; str++)
      43  		if (*str == c)
      44  			save = str;
      45  
      46  	return (char *) save;
      47  }