lib/linux_string.c

   1 /*
   2  *  linux/lib/string.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  */
   6
   7 #ifdef USE_HOSTCC
   8 #include <stdio.h>
   9 #endif
  10
  11 #include <linux/ctype.h>
  12 #include <linux/string.h>
  13
  14 /**
  15  * skip_spaces - Removes leading whitespace from @str.
  16  * @str: The string to be stripped.
  17  *
  18  * Returns a pointer to the first non-whitespace character in @str.
  19  */
  20 char *skip_spaces(const char *str)
  21 {
  22         while (isspace(*str))
  23                 ++str;
  24         return (char *)str;
  25 }
  26
  27 /**
  28  * strim - Removes leading and trailing whitespace from @s.
  29  * @s: The string to be stripped.
  30  *
  31  * Note that the first trailing whitespace is replaced with a %NUL-terminator
  32  * in the given string @s. Returns a pointer to the first non-whitespace
  33  * character in @s.
  34  */
  35 char *strim(char *s)
  36 {
  37         size_t size;
  38         char *end;
  39
  40         s = skip_spaces(s);
  41         size = strlen(s);
  42         if (!size)
  43                 return s;
  44
  45         end = s + size - 1;
  46         while (end >= s && isspace(*end))
  47                 end--;
  48         *(end + 1) = '\0';
  49
  50         return s;
  51 }