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/* $Id: string.c,v 1.1 2004-05-03 05:17:48 behdad Exp $
*
* Some string handling routines
*/
#include "c2man.h"
#include <ctype.h>
/* Copy the string into an allocated memory block.
* Return a pointer to the copy.
*/
char *
strduplicate (s)
const char *s; /* The string to copy. May be NULL */
{
char *dest;
if (!s) return NULL;
if ((dest = malloc((unsigned)(strlen(s)+1))) == NULL)
outmem();
strcpy(dest, s);
return dest;
}
#ifndef HAS_STRSTR
/* Return a pointer to the first occurence of the substring
* within the string, or NULL if not found.
*/
char *
strstr (src, key)
const char *src, *key;
{
char *s;
int keylen;
keylen = strlen(key);
s = strchr(src, *key);
while (s != NULL) {
if (strncmp(s, key, keylen) == 0)
return s;
s = strchr(s+1, *key);
}
return NULL;
}
#endif
/* compare two strings case insensitively, for up to n chars */
int strncmpi(s1, s2, n)
const char *s1, *s2;
size_t n;
{
while(n--)
{
char c1 = *s1, c2 = *s2;
if (c1 == '\0' && c2 == '\0') break;
if (isalpha(c1) && isupper(c1)) c1 = tolower(c1);
if (isalpha(c2) && isupper(c2)) c2 = tolower(c2);
if (c1 < c2) return -1;
if (c1 > c2) return 1;
s1++; s2++;
}
return 0;
}
/* convert string to upper case */
char *strtoupper(in)
char *in;
{
char *s;
for (s = in; *s; s++)
{
if (islower(*s)) *s = toupper(*s);
}
return in;
}
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