/*	$OpenPackages$ */
/*	$OpenBSD: util.c,v 1.21 2003/06/25 15:11:06 millert Exp $	*/
/*	$NetBSD: util.c,v 1.10 1996/12/31 17:56:04 christos Exp $	*/

/*
 * Copyright (c) 2001 Marc Espie.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE OPENBSD PROJECT AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OPENBSD
 * PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
/*
 * Missing stuff from OS's
 */

#include <sys/param.h>
#include <stdio.h>
#include "config.h"
#include "defines.h"

#ifdef sun

extern int errno, sys_nerr;
extern char *sys_errlist[];

char *
strerror(e)
    int e;
{
    static char buf[100];
    if (e < 0 || e >= sys_nerr) {
	snprintf(buf, sizeof buf, "Unknown error %d", e);
	return buf;
    }
    else
	return sys_errlist[e];
}
#endif

#ifdef ultrix
#include <string.h>

/* strdup
 *
 * Make a duplicate of a string.
 * For systems which lack this function.
 */
char *
strdup(str)
    const char *str;
{
    size_t len;
    char *p;

    if (str == NULL)
	return NULL;
    len = strlen(str) + 1;
    if ((p = malloc(len)) == NULL)
	return NULL;

    return memcpy(p, str, len);
}

#endif

#if defined(sun) || defined(__hpux) || defined(__sgi)

int
setenv(name, value, dum)
    const char *name;
    const char *value;
    int dum;
{
    char *p;
    int len = strlen(name) + strlen(value) + 2; /* = \0 */
    char *ptr = (char*)malloc(len);

    if (ptr == NULL)
	return -1;

    p = ptr;

    while (*name)
	*p++ = *name++;

    *p++ = '=';

    while (*value)
	*p++ = *value++;

    *p = '\0';

    len = putenv(ptr);
/*    free(ptr); */
    return len;
}
#endif

#ifdef __hpux
#include <sys/types.h>
#include <sys/param.h>
#include <sys/syscall.h>
#include <sys/signal.h>
#include <sys/stat.h>
#include <stdio.h>
#include <dirent.h>
#include <sys/time.h>
#include <time.h>
#include <unistd.h>


int
killpg(pid, sig)
    int pid, sig;
{
    return kill(-pid, sig);
}

void
srandom(seed)
    long seed;
{
    srand48(seed);
}

long
random()
{
    return lrand48();
}

/* turn into bsd signals */
void (*
signal(s, a))()
    int     s;
    void (*a)();
{
    struct sigvec osv, sv;

    (void)sigvector(s, (struct sigvec *)0, &osv);
    sv = osv;
    sv.sv_handler = a;
#ifdef SV_BSDSIG
    sv.sv_flags = SV_BSDSIG;
#endif

    if (sigvector(s, &sv, (struct sigvec *)0) == -1)
	return SIG_ERR;
    return osv.sv_handler;
}

#if !defined(BSD) && !defined(d_fileno)
# define d_fileno d_ino
#endif

#ifndef DEV_DEV_COMPARE
# define DEV_DEV_COMPARE(a, b) ((a) == (b))
#endif
#define ISDOT(c) ((c)[0] == '.' && ((c)[1] == '\0' || (c)[1] == '/'))
#define ISDOTDOT(c) ((c)[0] == '.' && ISDOT(&((c)[1])))


/* strrcpy():
 *	Like strcpy, going backwards and returning the new pointer
 */
static char *
strrcpy(ptr, str)
    char *ptr, *str;
{
    size_t len = strlen(str);

    while (len)
	*--ptr = str[--len];

    return ptr;
} /* end strrcpy */


char   *
getwd(pathname)
    char   *pathname;
{
    DIR    *dp;
    struct dirent *d;
    extern int errno;

    struct stat st_root, st_cur, st_next, st_dotdot;
    char    pathbuf[MAXPATHLEN], nextpathbuf[MAXPATHLEN * 2];
    char   *pathptr, *nextpathptr, *cur_name_add;

    /* find the inode of root */
    if (stat("/", &st_root) == -1) {
	(void)snprintf(pathname, MAXPATHLEN, 
	    "getwd: Cannot stat \"/\" (%s)", strerror(errno));
	return NULL;
    }
    pathbuf[MAXPATHLEN - 1] = '\0';
    pathptr = &pathbuf[MAXPATHLEN - 1];
    nextpathbuf[MAXPATHLEN - 1] = '\0';
    cur_name_add = nextpathptr = &nextpathbuf[MAXPATHLEN - 1];

    /* find the inode of the current directory */
    if (lstat(".", &st_cur) == -1) {
	(void)snprintf(pathname, MAXPATHLEN,
	    "getwd: Cannot stat \".\" (%s)", strerror(errno));
	return NULL;
    }
    nextpathptr = strrcpy(nextpathptr, "../");

    /* Descend to root */
    for (;;) {

	/* look if we found root yet */
	if (st_cur.st_ino == st_root.st_ino &&
	    DEV_DEV_COMPARE(st_cur.st_dev, st_root.st_dev)) {
	    (void)strlcpy(pathname, *pathptr != '/' ? "/" : pathptr, MAXPATHLEN);
	    return pathname;
	}

	/* open the parent directory */
	if (stat(nextpathptr, &st_dotdot) == -1) {
	    (void)snprintf(pathname, MAXPATHLEN,
		"getwd: Cannot stat directory \"%s\" (%s)",
		nextpathptr, strerror(errno));
	    return NULL;
	}
	if ((dp = opendir(nextpathptr)) == NULL) {
	    (void)snprintf(pathname, MAXPATHLEN,
		"getwd: Cannot open directory \"%s\" (%s)",
		nextpathptr, strerror(errno));
	    return NULL;
	}

	/* look in the parent for the entry with the same inode */
	if (DEV_DEV_COMPARE(st_dotdot.st_dev, st_cur.st_dev)) {
	    /* Parent has same device. No need to stat every member */
	    for (d = readdir(dp); d != NULL; d = readdir(dp))
		if (d->d_fileno == st_cur.st_ino)
		    break;
	}
	else {
	    /*
	     * Parent has a different device. This is a mount point so we
	     * need to stat every member
	     */
	    for (d = readdir(dp); d != NULL; d = readdir(dp)) {
		if (ISDOT(d->d_name) || ISDOTDOT(d->d_name))
		    continue;
		(void)strlcpy(cur_name_add, d->d_name, 
		    sizeof(nextpathbuf) MAXPATHLEN - (MAXPATHLEN - 1));
		if (lstat(nextpathptr, &st_next) == -1) {
		    (void)snprintf(pathname, MAXPATHLEN,
			"getwd: Cannot stat \"%s\" (%s)",
			d->d_name, strerror(errno));
		    (void)closedir(dp);
		    return NULL;
		}
		/* check if we found it yet */
		if (st_next.st_ino == st_cur.st_ino &&
		    DEV_DEV_COMPARE(st_next.st_dev, st_cur.st_dev))
		    break;
	    }
	}
	if (d == NULL) {
	    (void)snprintf(pathname, MAXPATHLEN,
		"getwd: Cannot find \".\" in \"..\"");
	    (void)closedir(dp);
	    return NULL;
	}
	st_cur = st_dotdot;
	pathptr = strrcpy(pathptr, d->d_name);
	pathptr = strrcpy(pathptr, "/");
	nextpathptr = strrcpy(nextpathptr, "../");
	(void)closedir(dp);
	*cur_name_add = '\0';
    }
} /* end getwd */


char	*sys_siglist[] = {
	"Signal 0",
	"Hangup",			/* SIGHUP    */
	"Interrupt",			/* SIGINT    */
	"Quit", 			/* SIGQUIT   */
	"Illegal instruction",		/* SIGILL    */
	"Trace/BPT trap",		/* SIGTRAP   */
	"IOT trap",			/* SIGIOT    */
	"EMT trap",			/* SIGEMT    */
	"Floating point exception",	/* SIGFPE    */
	"Killed",			/* SIGKILL   */
	"Bus error",			/* SIGBUS    */
	"Segmentation fault",		/* SIGSEGV   */
	"Bad system call",		/* SIGSYS    */
	"Broken pipe",			/* SIGPIPE   */
	"Alarm clock",			/* SIGALRM   */
	"Terminated",			/* SIGTERM   */
	"User defined signal 1",	/* SIGUSR1   */
	"User defined signal 2",	/* SIGUSR2   */
	"Child exited", 		/* SIGCLD    */
	"Power-fail restart",		/* SIGPWR    */
	"Virtual timer expired",	/* SIGVTALRM */
	"Profiling timer expired",	/* SIGPROF   */
	"I/O possible", 		/* SIGIO     */
	"Window size changes",		/* SIGWINDOW */
	"Stopped (signal)",		/* SIGSTOP   */
	"Stopped",			/* SIGTSTP   */
	"Continued",			/* SIGCONT   */
	"Stopped (tty input)",		/* SIGTTIN   */
	"Stopped (tty output)", 	/* SIGTTOU   */
	"Urgent I/O condition", 	/* SIGURG    */
	"Remote lock lost (NFS)",	/* SIGLOST   */
	"Signal 31",			/* reserved  */
	"DIL signal"			/* SIGDIL    */
};

int
utimes(file, tvp)
    char *file;
    struct timeval tvp[2];
{
    struct utimbuf t;

    t.actime  = tvp[0].tv_sec;
    t.modtime = tvp[1].tv_sec;
    return utime(file, &t);
}


#endif /* __hpux */

#if defined(sun) && defined(__svr4__)
#include <signal.h>

/* turn into bsd signals */
void (*
signal(s, a))()
    int     s;
    void (*a)();
{
    struct sigaction sa, osa;

    memset(&sa, 0, sizeof sa);
    sa.sa_handler = a;
    sigemptyset(&sa.sa_mask);
    sa.sa_flags = SA_RESTART;

    if (sigaction(s, &sa, &osa) == -1)
	return SIG_ERR;
    else
	return osa.sa_handler;
}

#endif

#ifndef BSD4_4
#include <stdarg.h>

#ifdef _IOSTRG
#define STRFLAG (_IOSTRG|_IOWRT)	/* no _IOWRT: avoid stdio bug */
#else
#define STRFLAG (_IOREAD)		/* XXX: Assume svr4 stdio */
#endif

int
vsnprintf(s, n, fmt, args)
	char *s;
	size_t n;
	const char *fmt;
	va_list args;
{
	FILE fakebuf;

	fakebuf._flag = STRFLAG;
	/*
	 * Some os's are char * _ptr, others are unsigned char *_ptr...
	 * We cast to void * to make everyone happy.
	 */
	fakebuf._ptr = (void *)s;
	fakebuf._cnt = n-1;
	fakebuf._file = -1;
	_doprnt(fmt, args, &fakebuf);
	fakebuf._cnt++;
	putc('\0', &fakebuf);
	if (fakebuf._cnt<0)
	    fakebuf._cnt = 0;
	return n-fakebuf._cnt-1;
}

int
snprintf(char *s, size_t n, const char *fmt, ...)
{
	va_list ap;
	int rv;

	va_start(ap, fmt);
	rv = vsnprintf(s, n, fmt, ap);
	va_end(ap);
	return rv;
}
#endif
#ifdef NEED_STRSTR
char *
strstr(string, substring)
	const char *string;		/* String to search. */
	const char *substring;		/* Substring to find in string */
{
	const char *a, *b;

	/*
	 * First scan quickly through the two strings looking for a single-
	 * character match.  When it's found, then compare the rest of the
	 * substring.
	 */

	for (b = substring; *string != 0; string += 1) {
		if (*string != *b)
			continue;
		a = string;
		for (;;) {
			if (*b == 0)
				return (char *)string;
			if (*a++ != *b++)
				break;
		}
		b = substring;
	}
	return NULL;
}
#endif

#ifdef NEED_FGETLN
char *
fgetln(stream, len)
    FILE *stream;
    size_t *len;
{
    static char *buffer = NULL;
    static size_t buflen = 0;

    if (buflen == 0) {
	buflen = 512;
	buffer = emalloc(buflen+1);
    }
    if (fgets(buffer, buflen+1, stream) == NULL)
	return NULL;
    *len = strlen(buffer);
    while (*len == buflen && buffer[*len-1] != '\n') {
	buffer = erealloc(buffer, 2*buflen + 1);
	if (fgets(buffer + buflen, buflen + 1, stream) == NULL)
	    return NULL;
	*len += strlen(buffer + buflen);
	buflen *= 2;
    }
    return buffer;
}
#endif