mesytec-mnode/external/nng/src/core/strs.c

175 lines
3.2 KiB
C

//
// Copyright 2020 Staysail Systems, Inc. <info@staysail.tech>
// Copyright 2017 Capitar IT Group BV <info@capitar.com>
//
// This software is supplied under the terms of the MIT License, a
// copy of which should be located in the distribution where this
// file was obtained (LICENSE.txt). A copy of the license may also be
// found online at https://opensource.org/licenses/MIT.
//
#include <ctype.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "core/nng_impl.h"
// This file contains implementation of utility functions that are not
// part of standard C99. (C11 has added some things here, but we cannot
// count on them.)
// Note that we supply our own version of strdup and strfree unconditionally,
// so that these can be freed with nni_free(strlen(s)+1) if desired. (Likewise
// a string buffer allocated with nni_alloc can be freed with nni_strfree
// provided the length is correct.)
char *
nni_strdup(const char *src)
{
char * dst;
size_t len = strlen(src) + 1;
if ((dst = nni_alloc(len)) != NULL) {
memcpy(dst, src, len);
}
return (dst);
}
void
nni_strfree(char *s)
{
if (s != NULL) {
nni_free(s, strlen(s) + 1);
}
}
size_t
nni_strlcpy(char *dst, const char *src, size_t len)
{
#ifdef NNG_HAVE_STRLCPY
return (strlcpy(dst, src, len));
#else
size_t n;
char c;
n = 0;
do {
c = *src++;
n++;
if (n < len) {
*dst++ = c;
} else if (n == len) {
*dst = '\0';
}
} while (c);
return (n - 1);
#endif
}
size_t
nni_strnlen(const char *s, size_t len)
{
#ifdef NNG_HAVE_STRNLEN
return (strnlen(s, len));
#else
size_t n;
for (n = 0; (n < len) && (*s); n++) {
s++;
}
return (n);
#endif
}
char *
nni_strcasestr(const char *s1, const char *s2)
{
#ifdef NNG_HAVE_STRCASESTR
return (strcasestr(s1, s2));
#else
const char *t1, *t2;
while (*s1) {
for (t1 = s1, t2 = s2; *t1 && *t2; t2++, t1++) {
if (tolower(*t1) != tolower(*t2)) {
break;
}
}
if (*t2 == 0) {
return ((char *) s1);
}
s1++;
}
return (NULL);
#endif
}
int
nni_strcasecmp(const char *s1, const char *s2)
{
#if defined(_WIN32)
return (_stricmp(s1, s2));
#elif defined(NNG_HAVE_STRCASECMP)
return (strcasecmp(s1, s2));
#else
for (;;) {
uint8_t c1 = (uint8_t) tolower(*s1++);
uint8_t c2 = (uint8_t) tolower(*s2++);
if (c1 == c2) {
if (c1 == 0) {
return (0);
}
continue;
}
return ((c1 < c2) ? -1 : 1);
}
return (0);
#endif
}
int
nni_strncasecmp(const char *s1, const char *s2, size_t n)
{
#if defined(_WIN32)
return (_strnicmp(s1, s2, n));
#elif defined(NNG_HAVE_STRNCASECMP)
return (strncasecmp(s1, s2, n));
#else
for (int i = 0; i < n; i++) {
uint8_t c1 = (uint8_t) tolower(*s1++);
uint8_t c2 = (uint8_t) tolower(*s2++);
if (c1 == c2) {
if (c1 == 0) {
return (0);
}
continue;
}
return ((c1 < c2) ? -1 : 1);
}
return (0);
#endif
}
// As with strdup, we always use our own, so that our strings
// can be freed with nni_strfree().
int
nni_asprintf(char **sp, const char *fmt, ...)
{
va_list ap;
size_t len;
char * s;
va_start(ap, fmt);
len = vsnprintf(NULL, 0, fmt, ap);
va_end(ap);
len++;
if ((s = nni_alloc(len)) == NULL) {
return (NNG_ENOMEM);
}
va_start(ap, fmt);
(void) vsnprintf(s, len, fmt, ap);
va_end(ap);
*sp = s;
return (0);
}