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/**
* \file rpmio/rpmstring.c
*/
#include "system.h"
#include <stdarg.h>
#include <stdio.h>
#include <rpm/rpmstring.h>
#include "debug.h"
int rstrcasecmp(const char * s1, const char * s2)
{
const char * p1 = s1;
const char * p2 = s2;
char c1, c2;
if (p1 == p2)
return 0;
do
{
c1 = rtolower (*p1++);
c2 = rtolower (*p2++);
if (c1 == '\0')
break;
}
while (c1 == c2);
return (int)(c1 - c2);
}
int rstrncasecmp(const char *s1, const char *s2, size_t n)
{
const char * p1 = s1;
const char * p2 = s2;
char c1, c2;
if (p1 == p2 || n == 0)
return 0;
do
{
c1 = rtolower (*p1++);
c2 = rtolower (*p2++);
if (c1 == '\0' || c1 != c2)
break;
} while (--n > 0);
return (int)(c1 - c2);
}
/*
* Simple and stupid asprintf() clone.
* FIXME: write to work with non-C99 vsnprintf or check for one in configure.
*/
int rasprintf(char **strp, const char *fmt, ...)
{
int n;
va_list ap;
char * p = NULL;
if (strp == NULL)
return -1;
va_start(ap, fmt);
n = vsnprintf(NULL, 0, fmt, ap);
va_end(ap);
if (n >= -1) {
size_t nb = n + 1;
p = xmalloc(nb);
va_start(ap, fmt);
n = vsnprintf(p, nb, fmt, ap);
va_end(ap);
}
*strp = p;
return n;
}
/*
* Concatenate two strings with dynamically (re)allocated
* memory what prevents static buffer overflows by design.
* *dest is reallocated to the size of strings to concatenate.
*
* Note:
* 1) char *buf = rstrcat(NULL,"string"); is the same like rstrcat(&buf,"string");
* 2) rstrcat(&buf,NULL) returns buf
* 3) rstrcat(NULL,NULL) returns NULL
* 4) *dest and src can overlap
*/
char *rstrcat(char **dest, const char *src)
{
if ( src == NULL ) {
return dest != NULL ? *dest : NULL;
}
if ( dest == NULL ) {
return xstrdup(src);
}
{
size_t dest_size = *dest != NULL ? strlen(*dest) : 0;
size_t src_size = strlen(src);
*dest = xrealloc(*dest, dest_size+src_size+1); /* include '\0' */
memmove(&(*dest)[dest_size], src, src_size+1);
}
return *dest;
}
/*
* Concatenate strings with dynamically (re)allocated
* memory what prevents static buffer overflows by design.
* *dest is reallocated to the size of strings to concatenate.
* List of strings has to be NULL terminated.
*
* Note:
* 1) char *buf = rstrscat(NULL,"string",NULL); is the same like rstrscat(&buf,"string",NULL);
* 2) rstrscat(&buf,NULL) returns buf
* 3) rstrscat(NULL,NULL) returns NULL
* 4) *dest and argument strings can overlap
*/
char *rstrscat(char **dest, const char *arg, ...)
{
va_list ap;
size_t arg_size, dst_size;
const char *s;
char *dst, *p;
dst = dest ? *dest : NULL;
if ( arg == NULL ) {
return dst;
}
va_start(ap, arg);
for (arg_size=0, s=arg; s; s = va_arg(ap, const char *))
arg_size += strlen(s);
va_end(ap);
dst_size = dst ? strlen(dst) : 0;
dst = xrealloc(dst, dst_size+arg_size+1); /* include '\0' */
p = &dst[dst_size];
va_start(ap, arg);
for (s = arg; s; s = va_arg(ap, const char *)) {
size_t size = strlen(s);
memmove(p, s, size);
p += size;
}
*p = '\0';
if ( dest ) {
*dest = dst;
}
return dst;
}
/*
* Adapted from OpenBSD, strlcpy() originally developed by
* Todd C. Miller <Todd.Miller@courtesan.com>
*/
size_t rstrlcpy(char *dest, const char *src, size_t n)
{
char *d = dest;
const char *s = src;
size_t len = n;
/* Copy as many bytes as will fit */
if (len != 0) {
while (--len != 0) {
if ((*d++ = *s++) == '\0')
break;
}
}
/* Not enough room in dst, add NUL and traverse rest of src */
if (len == 0) {
if (n != 0)
*d = '\0'; /* NUL-terminate dst */
while (*s++)
;
}
return s - src - 1; /* count does not include NUL */
}
unsigned int rstrhash(const char * string)
{
/* Jenkins One-at-a-time hash */
unsigned int hash = 0xe4721b68;
while (*string != '\0') {
hash += *string;
hash += (hash << 10);
hash ^= (hash >> 6);
string++;
}
hash += (hash << 3);
hash ^= (hash >> 11);
hash += (hash << 15);
return hash;
}
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