mini/string.c at master · theStack/mini · GitHub

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/* string.c -- standard C string-manipulation functions.

Copyright (C) 2008 Segher Boessenkool <segher@kernel.crashing.org>
Copyright (C) 2009 Haxx Enterprises <bushing@gmail.com>

Portions taken from the Public Domain C Library (PDCLib).
https://negix.net/trac/pdclib

# This code is licensed to you under the terms of the GNU GPL, version 2;
# see file COPYING or http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
*/

#include"string.h"

size_tstrlen(constchar*s)
{
size_tlen;

for (len=0; s[len]; len++)
 ;

returnlen;
}

size_tstrnlen(constchar*s, size_tcount)
{
size_tlen;

for (len=0; s[len] &&len<count; len++)
 ;

returnlen;
}

void*memset(void*b, intc, size_tlen)
{
size_ti;

for (i=0; i<len; i++)
 ((unsigned char*)b)[i] =c;

returnb;
}

void*memcpy(void*dst, constvoid*src, size_tlen)
{
size_ti;

for (i=0; i<len; i++)
 ((unsigned char*)dst)[i] = ((unsigned char*)src)[i];

returndst;
}

intmemcmp(constvoid*s1, constvoid*s2, size_tlen)
{
size_ti;
constunsigned char*p1= (constunsigned char*) s1;
constunsigned char*p2= (constunsigned char*) s2;

for (i=0; i<len; i++)
if (p1[i] !=p2[i]) returnp1[i] -p2[i];

return0;
}

intstrcmp(constchar*s1, constchar*s2)
{
size_ti;

for (i=0; s1[i] &&s1[i] ==s2[i]; i++)
 ;

returns1[i] -s2[i];
}

intstrncmp(constchar*s1, constchar*s2, size_tn)
{
size_ti;

for (i=0; i<n&&s1[i] &&s1[i] ==s2[i]; i++)
 ;
if (i==n) return0;
returns1[i] -s2[i];
}

size_tstrlcpy(char*dest, constchar*src, size_tmaxlen)
{
size_tlen,needed;

len=needed=strnlen(src, maxlen-1) +1;
if (len >= maxlen)
len=maxlen-1;

memcpy(dest, src, len);
dest[len]='\0';

returnneeded-1;
}

size_tstrlcat(char*dest, constchar*src, size_tmaxlen)
{
size_tused;

used=strnlen(dest, maxlen-1);
returnused+strlcpy(dest+used, src, maxlen-used);
}

char*strchr(constchar*s, intc)
{
size_ti;

for (i=0; s[i]; i++)
if (s[i] == (char)c) return (char*)s+i;

returnNULL;
}

size_tstrspn(constchar*s1, constchar*s2)
{
size_tlen=0;
constchar*p;

while (s1[len]) {
p=s2;
while (*p) {
if (s1[len] ==*p)
break;

++p;
 }
if (!*p)
returnlen;

++len;
	}

returnlen;
}

size_tstrcspn(constchar*s1, constchar*s2)
{
size_tlen=0;
constchar*p;

while (s1[len]) {
p=s2;
while (*p)
if (s1[len] ==*p++)
returnlen;

++len;
	}

returnlen;
}