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_strcmp.c
62 lines (55 loc) · 1.05 KB
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_strcmp.c
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/*
** _strcmp.c for my_ls in /Users/mataejoon/programming/lib/dlist
**
** Made by Mathieu TAN
** Login <tan_m@etna-alternance.net>
**
** Started on Thu Dec 20 20:15:43 2012 Mathieu TAN
** Last update Fri Dec 21 01:22:25 2012 Mathieu TAN
*/
#include <stdio.h>
#define ISUPCASE(c) ((c) >= 'A' && (c) <= 'Z')
#define ISLOWCASE(c) ((c) >= 'a' && (c) <= 'z')
static char lowercase(char c)
{
if (ISLOWCASE(c))
return (c - ('a' - 'A'));
return (c);
}
int _strcasecmp(char *s1, char *s2)
{
while (*s1 && *s2)
{
if (lowercase(*s1) - lowercase(*s2))
return (lowercase(*s1) - lowercase(*s2));
s1++;
s2++;
}
return (lowercase(*s1) - lowercase(*s2));
}
int _strcmp(char *s1, char *s2)
{
while (*s1 && *s2)
{
if (*s1 - *s2)
return (*s1 - *s2);
s1++;
s2++;
}
return (*s1 - *s2);
}
int _strncmp(char *s1, char *s2, int n)
{
int res;
int i;
i = 0;
res = s1[i] - s2[i];
while ((s1[i] || s2[i]) && i < n)
{
res = s1[i] - s2[i];
if (res)
return (res);
i++;
}
return (res);
}