xstring.cc

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/*
 * Copyright (C) 1996-2023 The Squid Software Foundation and contributors
 *
 * Squid software is distributed under GPLv2+ license and includes
 * contributions from numerous individuals and organizations.
 * Please see the COPYING and CONTRIBUTORS files for details.
 */
 
#include "squid.h"
#include "compat/xalloc.h"
#include "compat/xstring.h"
 
#include <cerrno>
 
char *
xstrdup(const char *s)
{
    if (!s) {
        if (failure_notify) {
            (*failure_notify) ("xstrdup: tried to dup a nullptr!\n");
        } else {
            errno = EINVAL;
            perror("xstrdup: tried to dup a nullptr!");
        }
        exit(1);
    }
 
    /* copy string, including terminating character */
    size_t sz = strlen(s) + 1;
    char *p = static_cast<char *>(xmalloc(sz));
    memcpy(p, s, sz);
 
    return p;
}
 
char *
xstrncpy(char *dst, const char *src, size_t n)
{
    char *r = dst;
 
    if (!n || !dst)
        return dst;
 
    if (src)
        while (--n != 0 && *src != '\0') {
            *dst = *src;
            ++dst;
            ++src;
        }
 
    *dst = '\0';
    return r;
}
 
char *
xstrndup(const char *s, size_t n)
{
    if (!s) {
        errno = EINVAL;
        if (failure_notify) {
            (*failure_notify) ("xstrndup: tried to dup a nullptr!\n");
        } else {
            perror("xstrndup: tried to dup a nullptr!");
        }
        exit(1);
    }
 
    size_t sz = strlen(s) + 1;
    // size_t is unsigned, as mandated by c99 and c++ standards.
    if (sz > n)
        sz = n;
 
    char *p = xstrncpy(static_cast<char *>(xmalloc(sz)), s, sz);
    return p;
}