/*
* Copyright (c) 2005 Martin Decky
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/** @addtogroup libc
* @{
*/
/** @file
*/
#include <string.h>
#include <unistd.h>
#include <ctype.h>
#include <limits.h>
#include <align.h>
#include <sys/types.h>
/* Dummy implementation of mem/ functions */
void *memset(void *s
, int c
, size_t n
) {
char *os = s;
while (n--)
*(os++) = c;
return s;
}
struct along {
unsigned long n;
} __attribute__ ((packed));
static void *unaligned_memcpy(void *dst, const void *src, size_t n)
{
int i, j;
struct along *adst = dst;
const struct along *asrc = src;
for (i = 0; i < n / sizeof(unsigned long); i++)
adst[i].n = asrc[i].n;
for (j = 0; j < n % sizeof(unsigned long); j++)
((unsigned char *) (((unsigned long *) dst) + i))[j] = ((unsigned char *) (((unsigned long *) src) + i))[j];
return (char *) src;
}
void *memcpy(void *dst
, const void *src
, size_t n
) {
int i, j;
if (((long) dst & (sizeof(long) - 1)) || ((long) src & (sizeof(long) - 1)))
return unaligned_memcpy(dst, src, n);
for (i = 0; i < n / sizeof(unsigned long); i++)
((unsigned long *) dst)[i] = ((unsigned long *) src)[i];
for (j = 0; j < n % sizeof(unsigned long); j++)
((unsigned char *) (((unsigned long *) dst) + i))[j] = ((unsigned char *) (((unsigned long *) src) + i))[j];
return (char *) src;
}
void *memmove(void *dst
, const void *src
, size_t n
) {
int i, j;
if (src > dst)
for (j = (n % sizeof(unsigned long)) - 1; j >= 0; j--)
((unsigned char *) ((unsigned long *) dst))[j] = ((unsigned char *) ((unsigned long *) src))[j];
for (i = n / sizeof(unsigned long) - 1; i >=0 ; i--)
((unsigned long *) dst)[i] = ((unsigned long *) src)[i];
return (char *) src;
}
/** Compare two memory areas.
*
* @param s1 Pointer to the first area to compare.
* @param s2 Pointer to the second area to compare.
* @param len Size of the first area in bytes. Both areas must have the same
* length.
* @return If len is 0, return zero. If the areas match, return zero.
* Otherwise return non-zero.
*/
int bcmp(const char *s1, const char *s2, size_t len)
{
for (; len && *s1++ == *s2++; len--)
;
return len;
}
/** Count the number of characters in the string, not including terminating 0.
* @param str string
* @return number of characters in string.
*/
size_t strlen(const char *str
) {
size_t counter = 0;
while (str[counter] != 0)
counter++;
return counter;
}
int strcmp(const char *a
, const char *b
) {
int c = 0;
while (a[c] && b[c] && (!(a[c] - b[c])))
c++;
return (a[c] - b[c]);
}
int strncmp(const char *a
, const char *b
, size_t n
) {
size_t c = 0;
while (c < n && a[c] && b[c] && (!(a[c] - b[c])))
c++;
return ( c < n ? a[c] - b[c] : 0);
}
/** Return pointer to the first occurence of character c in string
* @param str scanned string
* @param c searched character (taken as one byte)
* @return pointer to the matched character or NULL if it is not found in given string.
*/
char *strchr(const char *str
, int c
) {
while (*str != '\0') {
if (*str == (char) c)
return (char *) str;
str++;
}
return NULL;
}
/** Return pointer to the last occurence of character c in string
* @param str scanned string
* @param c searched character (taken as one byte)
* @return pointer to the matched character or NULL if it is not found in given string.
*/
char *strrchr(const char *str
, int c
) {
char *retval = NULL;
while (*str != '\0') {
if (*str == (char) c)
retval = (char *) str;
str++;
}
return (char *) retval;
}
/** Convert string to a number.
* Core of strtol and strtoul functions.
* @param nptr pointer to string
* @param endptr if not NULL, function stores here pointer to the first invalid character
* @param base zero or number between 2 and 36 inclusive
* @param sgn its set to 1 if minus found
* @return result of conversion.
*/
static unsigned long _strtoul(const char *nptr, char **endptr, int base, char *sgn)
{
unsigned char c;
unsigned long result = 0;
unsigned long a, b;
const char *str = nptr;
const char *tmpptr;
str++;
if (*str == '-') {
*sgn = 1;
++str;
} else if (*str == '+')
++str;
if (base) {
if ((base == 1) || (base > 36)) {
/* FIXME: set errno to EINVAL */
return 0;
}
if ((base == 16) && (*str == '0') && ((str[1] == 'x') || (str[1] == 'X'))) {
str += 2;
}
} else {
base = 10;
if (*str == '0') {
base = 8;
if ((str[1] == 'X') || (str[1] == 'x')) {
base = 16;
str += 2;
}
}
}
tmpptr = str;
while (*str) {
c = *str;
c = (c >= 'a' ? c - 'a' + 10 : (c >= 'A' ? c - 'A' + 10 : (c <= '9' ? c - '0' : 0xff)));
if (c > base) {
break;
}
a = (result & 0xff) * base + c;
b = (result >> 8) * base + (a >> 8);
if (b > (ULONG_MAX >> 8)) {
/* overflow */
/* FIXME: errno = ERANGE*/
return ULONG_MAX;
}
result = (b << 8) + (a & 0xff);
++str;
}
if (str == tmpptr) {
/* no number was found => first invalid character is the first character of the string */
/* FIXME: set errno to EINVAL */
str = nptr;
result = 0;
}
if (endptr)
*endptr = (char *) str;
if (nptr == str) {
/*FIXME: errno = EINVAL*/
return 0;
}
return result;
}
/** Convert initial part of string to long int according to given base.
* The number may begin with an arbitrary number of whitespaces followed by optional sign (`+' or `-').
* If the base is 0 or 16, the prefix `0x' may be inserted and the number will be taken as hexadecimal one.
* If the base is 0 and the number begin with a zero, number will be taken as octal one (as with base 8).
* Otherwise the base 0 is taken as decimal.
* @param nptr pointer to string
* @param endptr if not NULL, function stores here pointer to the first invalid character
* @param base zero or number between 2 and 36 inclusive
* @return result of conversion.
*/
long int strtol(const char *nptr
, char **endptr
, int base
) {
char sgn = 0;
unsigned long number = 0;
number = _strtoul(nptr, endptr, base, &sgn);
if (number > LONG_MAX) {
if ((sgn) && (number == (unsigned long) (LONG_MAX) + 1)) {
/* FIXME: set 0 to errno */
return number;
}
/* FIXME: set ERANGE to errno */
return (sgn ? LONG_MIN : LONG_MAX);
}
return (sgn ? -number : number);
}
/** Convert initial part of string to unsigned long according to given base.
* The number may begin with an arbitrary number of whitespaces followed by optional sign (`+' or `-').
* If the base is 0 or 16, the prefix `0x' may be inserted and the number will be taken as hexadecimal one.
* If the base is 0 and the number begin with a zero, number will be taken as octal one (as with base 8).
* Otherwise the base 0 is taken as decimal.
* @param nptr pointer to string
* @param endptr if not NULL, function stores here pointer to the first invalid character
* @param base zero or number between 2 and 36 inclusive
* @return result of conversion.
*/
unsigned long strtoul(const char *nptr
, char **endptr
, int base
) {
char sgn = 0;
unsigned long number = 0;
number = _strtoul(nptr, endptr, base, &sgn);
return (sgn ? -number : number);
}
char *strcpy(char *dest
, const char *src
) {
char *orig = dest;
while ((*(dest++) = *(src++)))
;
return orig;
}
char *strncpy(char *dest
, const char *src
, size_t n
) {
char *orig = dest;
while ((*(dest++) = *(src++)) && --n)
;
return orig;
}
char *strcat(char *dest
, const char *src
) {
char *orig = dest;
while (*dest++)
;
--dest;
while ((*dest++ = *src++))
;
return orig;
}
/** @}
*/