source: rtems/cpukit/shttpd/string.c @ 484cd8d

/*
 * Copyright (c) 2004-2005 Sergey Lyubka <valenok@gmail.com>
 * All rights reserved
 *
 * "THE BEER-WARE LICENSE" (Revision 42):
 * Sergey Lyubka wrote this file.  As long as you retain this notice you
 * can do whatever you want with this stuff. If we meet some day, and you think
 * this stuff is worth it, you can buy me a beer in return.
 */

#include "defs.h"

void
my_strlcpy(register char *dst, register const char *src, size_t n)
{
        for (; *src != '\0' && n > 1; n--)
                *dst++ = *src++;
        *dst = '\0';
}

int
my_strncasecmp(const char *str1, const char *str2, size_t len)
{
        register const unsigned char    *s1 = (unsigned char *) str1,
                                        *s2 = (unsigned char *) str2, *e;
        int                             ret;

        for (e = s1 + len - 1; s1 < e && *s1 != '\0' && *s2 != '\0' &&
            tolower(*s1) == tolower(*s2); s1++, s2++) ;
        ret = tolower(*s1) - tolower(*s2);

        return (ret);
}

char *
my_strndup(const char *ptr, size_t len)
{
        char    *p;

        if ((p = malloc(len + 1)) != NULL)
                my_strlcpy(p, ptr, len + 1);

        return (p);

}

char *
my_strdup(const char *str)
{
        return (my_strndup(str, strlen(str)));
}

/*
 * Sane snprintf(). Acts like snprintf(), but never return -1 or the
 * value bigger than supplied buffer.
 * Thanks Adam Zeldis to pointing snprintf()-caused vulnerability
 * in his audit report.
 */
int
my_snprintf(char *buf, size_t buflen, const char *fmt, ...)
{
        va_list         ap;
        int             n;

        if (buflen == 0)
                return (0);

        va_start(ap, fmt);
        n = vsnprintf(buf, buflen, fmt, ap);
        va_end(ap);

        if (n < 0 || (size_t) n >= buflen)
                n = buflen - 1;
        buf[n] = '\0';

        return (n);
}