/*
 *      cook - file construction tool
 *      Copyright (C) 1991-1994, 1997, 1998, 2006, 2007 Peter Miller;
 *      All rights reserved.
 *
 *      This program is free software; you can redistribute it and/or modify
 *      it under the terms of the GNU General Public License as published by
 *      the Free Software Foundation; either version 2 of the License, or
 *      (at your option) any later version.
 *
 *      This program is distributed in the hope that it will be useful,
 *      but WITHOUT ANY WARRANTY; without even the implied warranty of
 *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *      GNU General Public License for more details.
 *
 *      You should have received a copy of the GNU General Public License
 *      along with this program; if not, write to the Free Software
 *      Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
 *
 * MANIFEST: functions to implement missing ANSI C <string.h> functions
 *
 * This file contains functions for use with non-ANSI conforming systems
 * to implement absent ANSI functionality.
 */

#include <common/ac/stddef.h>
#include <common/ac/stdlib.h>
#include <common/ac/string.h>
#include <common/ac/stdio.h>

#include <common/main.h>


/*
 *  NAME
 *      strerror - string for error number
 *
 *  SYNOPSIS
 *      char *strerror(int errnum);
 *
 *  DESCRIPTION
 *      The strerror function maps the error number in errnum to an error
 *      message string.
 *
 *  RETURNS
 *      The strerror function returns a pointer to the string, the contents of
 *      which are implementation-defined.  The array pointed to shall not be
 *      modified by the program, but may be overwritten by a subsequent call to
 *      the strerror function.
 *
 *  CAVEAT
 *      Unknown errors will be rendered in the form "Error %d", where %d will
 *      be replaced by a decimal representation of the error number.
 */

#ifndef HAVE_STRERROR

char *
strerror(n)
        int             n;
{
        extern int      sys_nerr;
        extern char     *sys_errlist[];
        static char     buffer[16];

        if (n < 1 || n > sys_nerr)
        {
                sprintf(buffer, "Error %d", n);
                return buffer;
        }
        return sys_errlist[n];
}

#endif /* !HAVE_STRERROR */


#ifndef HAVE_STRCASECMP

int
strcasecmp(s1, s2)
        const char      *s1;
        const char      *s2;
{
        int             c1;
        int             c2;

        for (;;)
        {
                c1 = *s1++;
                if (islower(c1))
                        c1 = toupper(c1);
                c2 = *s2++;
                if (islower(c2))
                        c2 = toupper(c2);
                if (c1 != c2)
                {
                        /*
                         * if s1 is a leading substring of s2, must
                         * return -1, even if the next character of s2
                         * is negative.
                         */
                        if (!c1)
                                return -1;
                        if (c1 < c2)
                                return -1;
                        return 1;
                }
                if (!c1)
                        return 0;
        }
}

#endif /* !HAVE_STRCASECMP */


#ifndef HAVE_STRSIGNAL

char *
strsignal(n)
        int     n;
{
        static char buffer[16];

        switch (n)
        {
#ifdef SIGHUP
        case SIGHUP:
                return "hang up [SIGHUP]";
#endif /* SIGHUP */

#ifdef SIGINT
        case SIGINT:
                return "user interrupt [SIGINT]";
#endif /* SIGINT */

#ifdef SIGQUIT
        case SIGQUIT:
                return "user quit [SIGQUIT]";
#endif /* SIGQUIT */

#ifdef SIGILL
        case SIGILL:
                return "illegal instruction [SIGILL]";
#endif /* SIGILL */

#ifdef SIGTRAP
        case SIGTRAP:
                return "trace trap [SIGTRAP]";
#endif /* SIGTRAP */

#ifdef SIGIOT
        case SIGIOT:
                return "abort [SIGIOT]";
#endif /* SIGIOT */

#ifdef SIGEMT
        case SIGEMT:
                return "EMT instruction [SIGEMT]";
#endif /* SIGEMT */

#ifdef SIGFPE
        case SIGFPE:
                return "floating point exception [SIGFPE]";
#endif /* SIGFPE */

#ifdef SIGKILL
        case SIGKILL:
                return "kill [SIGKILL]";
#endif /* SIGKILL */

#ifdef SIGBUS
        case SIGBUS:
                return "bus error [SIGBUS]";
#endif /* SIGBUS */

#ifdef SIGSEGV
        case SIGSEGV:
                return "segmentation violation [SIGSEGV]";
#endif /* SIGSEGV */

#ifdef SIGSYS
        case SIGSYS:
                return "bad argument to system call [SIGSYS]";
#endif /* SIGSYS */

#ifdef SIGPIPE
        case SIGPIPE:
                return "write on a pipe with no one to read it [SIGPIPE]";
#endif /* SIGPIPE */

#ifdef SIGALRM
        case SIGALRM:
                return "alarm clock [SIGALRM]";
#endif /* SIGALRM */

#ifdef SIGTERM
        case SIGTERM:
                return "software termination [SIGTERM]";
#endif /* SIGTERM */

#ifdef SIGUSR1
        case SIGUSR1:
                return "user defined signal one [SIGUSR1]";
#endif /* SIGUSR1 */

#ifdef SIGUSR2
        case SIGUSR2:
                return "user defined signal two [SIGUSR2]";
#endif /* SIGUSR2 */

#ifdef SIGCLD
        case SIGCLD:
                return "death of child [SIGCLD]";
#endif /* SIGCLD */

#ifdef SIGPWR
        case SIGPWR:
                return "power failure [SIGPWR]";
#endif /* SIGPWR */

        default:
                sprintf(buffer, "signal %d", n);
                return buffer;
        }
}

#endif /* !HAVE_STRSIGNAL */
#ifndef HAVE_STRENDCPY

char *
strendcpy(char *dst, const char *src, const char *end)
{
    if (dst < end)
    {
        /* leave room for terminating NUL */
        end--;
        while (dst < end && *src)
            *dst++ = *src++;
        *dst = '\0';
        if (*src)
        {
            /* return end parameter if truncated */
            dst++;
        }
    }
    return dst;
}

#endif /* !HAVE_STRENDCPY */