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/* vi: set sw=4 ts=4: */
/* Copyright (C) 1995,1996 Robert de Bath <rdebath@cix.compulink.co.uk>
* This file is part of the Linux-8086 C library and is distributed
* under the GNU Library General Public License.
*
* Many of the functions in this file have been rewritten for correctness
* (but not necessarily speed) by Erik Andersen <andersee@debian.org>
*/
#include <string.h>
#include <malloc.h>
/********************** Function strlen ************************************/
#ifdef L_strlen
size_t strlen(const char *str)
{
register char *ptr = (char *) str;
while (*ptr)
ptr++;
return (ptr - str);
}
#endif
/********************** Function strcat ************************************/
#ifdef L_strcat
char *strcat(char *dst, const char *src)
{
strcpy(dst + strlen(dst), src);
return dst;
}
#endif
/********************** Function strcpy ************************************/
#ifdef L_strcpy
char *strcpy(char *dst, const char *src)
{
register char *ptr = dst;
while (*src)
*dst++ = *src++;
*dst = '\0';
return ptr;
}
#endif
/********************** Function strcmp ************************************/
#ifdef L_strcmp
int strcmp(const char *s1, const char *s2)
{
unsigned register char c1, c2;
do {
c1 = (unsigned char) *s1++;
c2 = (unsigned char) *s2++;
if (c1 == '\0')
return c1 - c2;
}
while (c1 == c2);
return c1 - c2;
}
#endif
/********************** Function strncat ************************************/
#ifdef L_strncat
char *strncat(char *dst, const char *src, size_t len)
{
register char *s1 = dst + strlen(dst), *s2;
s2 = memchr(src, 0, len);
if (s2) {
memcpy(s1, src, s2 - src + 1);
} else {
memcpy(s1, src, len);
s1[len] = '\0';
}
return dst;
}
#endif
/********************** Function strncpy ************************************/
#ifdef L_strncpy
char *strncpy(char *dst, const char *src, size_t len)
{
char *ptr = dst;
while (len--) {
if (*src)
*dst++ = *src++;
else
*dst++ = '\0';
}
return ptr;
}
#endif
/********************** Function strncmp ************************************/
#ifdef L_strncmp
int strncmp(const char *s1, const char *s2, size_t len)
{
unsigned register char c1 = '\0';
unsigned register char c2 = '\0';
while (len > 0) {
c1 = (unsigned char) *s1++;
c2 = (unsigned char) *s2++;
if (c1 == '\0' || c1 != c2)
return c1 - c2;
len--;
}
return c1 - c2;
}
#endif
/********************** Function strchr ************************************/
#ifdef L_strchr
char *strchr(const char *str, int c)
{
register char ch;
do {
if ((ch = *str) == c)
return (char *) str;
str++;
}
while (ch);
return 0;
}
#endif
/********************** Function strrchr ************************************/
#ifdef L_strrchr
char *strrchr(const char *str, int c)
{
register char *prev = 0;
register char *ptr = (char *) str;
/* For null it's just like strlen */
if (c == '\0')
return ptr + strlen(ptr);
/* everything else just step along the string. */
while ((ptr = strchr(ptr, c)) != 0) {
prev = ptr;
ptr++;
}
return prev;
}
#endif
/********************** Function strdup ************************************/
#ifdef L_strdup
char *strdup(const char *str)
{
register size_t len;
register char *dst;
len = strlen(str) + 1;
dst = (char *) malloc(len);
if (dst)
memcpy(dst, str, len);
return dst;
}
#endif
/********************** Function memcpy ************************************/
#ifdef L_memcpy
void *memcpy(void *dst, const void *src, size_t len)
{
register char *a = dst;
register const char *b = src;
while (len--)
*a++ = *b++;
return dst;
}
#endif
/********************** Function memccpy ************************************/
#ifdef L_memccpy
void *memccpy(void *dst, const void *src, int c, size_t len)
{
register char *a = dst;
register const char *b = src;
while (len--) {
if ((*a++ = *b++) == c)
return a;
}
return 0;
}
#endif
/********************** Function memset ************************************/
#ifdef L_memset
void *memset(void *str, int c, size_t len)
{
register char *a = str;
while (len--)
*a++ = c;
return str;
}
#endif
/********************** Function memmove ************************************/
#ifdef L_memmove
void *memmove(void *dst, const void *src, size_t len)
{
register char *s1 = dst, *s2 = (char *) src;
/* This bit of sneakyness c/o Glibc, it assumes the test is unsigned */
if (s1 - s2 >= len)
return memcpy(dst, src, len);
/* This reverse copy only used if we absolutly have to */
s1 += len;
s2 += len;
while (len-- > 0)
*(--s1) = *(--s2);
return dst;
}
#endif
/********************** Function memchr ************************************/
#ifdef L_memchr
void *memchr(const void *str, int c, size_t len)
{
register unsigned char *ptr = (unsigned char *) str;
while (len--) {
if (*ptr == (unsigned char) c)
return ptr;
ptr++;
}
return 0;
}
#endif
/********************** Function memcmp ************************************/
#ifdef L_memcmp
int memcmp(const void *s1, const void *s2, size_t len)
{
unsigned char *c1 = (unsigned char *)s1;
unsigned char *c2 = (unsigned char *)s2;
while (len--) {
if (*c1 != *c2)
return *c1 - *c2;
c1++;
c2++;
}
return 0;
}
#endif
/********************** THE END ********************************************/
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