misc/string.c

   1 /*
   2  * implementation of MSDEVS extensions to string.h
   3  *
   4  * Copyright 1999 Corel Corporation  (Albert den Haan)
   5  */
   6
   7 /* WARNING: The Wine declarations are in tchar.h for now since string.h is
   8  * not available to be altered in most development environments.  MSDEVS 5
   9  * declarse these functions in its own "string.h" */
  10
  11 #include "tchar.h"
  12
  13 #include <ctype.h>
  14 #include <assert.h>
  15
  16 char *_strlwr(char *string) {
  17     char *cp;
  18
  19     assert(string != NULL);
  20
  21     for(cp = string; *cp; cp++) {
  22         *cp = tolower(*cp);
  23     }
  24     return string;
  25 }
  26
  27 char *_strrev(char *string) {
  28     char *pcFirst, *pcLast;
  29     assert(string != NULL);
  30
  31     pcFirst = pcLast = string;
  32
  33     /* find the last character of the string
  34      * (i.e. before the assumed nul-character) */
  35     while(*(pcLast + 1)) {
  36         pcLast++;
  37     }
  38
  39     /* if the following ASSERT fails look for a bad (i.e. not nul-terminated)
  40      * string */
  41     assert(pcFirst <= pcLast);
  42
  43     /* reverse the string */
  44     while(pcFirst < pcLast) {
  45         /* swap characters across the middle */
  46         char cTemp = *pcFirst;
  47         *pcFirst = *pcLast;
  48         *pcLast = cTemp;
  49         /* move towards the middle of the string */
  50         pcFirst++;
  51         pcLast--;
  52     }
  53
  54     return string;
  55 }
  56
  57 char *_strupr(char *string) {
  58     char *cp;
  59
  60     assert(string != NULL);
  61
  62     for(cp = string; *cp; cp++) {
  63         *cp = toupper(*cp);
  64     }
  65     return string;
  66 }
  67