Tools/WinSN5.0Ver.iso/NETSCAP.50/WIN1998.ZIP/ns/nsprpub/config/pathsub.c

C/C++ Source or Header | 1998-04-08 | 4.6 KB | 220 lines

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/*
 * The contents of this file are subject to the Netscape Public License
 * Version 1.0 (the "NPL"); you may not use this file except in
 * compliance with the NPL.  You may obtain a copy of the NPL at
 * http://www.mozilla.org/NPL/
 *
 * Software distributed under the NPL is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
 * for the specific language governing rights and limitations under the
 * NPL.
 *
 * The Initial Developer of this code under the NPL is Netscape
 * Communications Corporation.  Portions created by Netscape are
 * Copyright (C) 1998 Netscape Communications Corporation.  All Rights
 * Reserved.
 */

/*
** Pathname subroutines.
**
** Brendan Eich, 8/29/95
*/
#include <assert.h>
#include <sys/types.h>
#include <dirent.h>
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include "pathsub.h"
#ifdef USE_REENTRANT_LIBC
#include "libc_r.h"
#endif /* USE_REENTRANT_LIBC */

char *program;

void
fail(char *format, ...)
{
    int error;
    va_list ap;

#ifdef USE_REENTRANT_LIBC
    R_STRERROR_INIT_R();
#endif

    error = errno;
    fprintf(stderr, "%s: ", program);
    va_start(ap, format);
    vfprintf(stderr, format, ap);
    va_end(ap);
    if (error)

#ifdef USE_REENTRANT_LIBC
    R_STRERROR_R(errno);
    fprintf(stderr, ": %s", r_strerror_r);
#else
    fprintf(stderr, ": %s", strerror(errno));
#endif

    putc('\n', stderr);
    exit(1);
}

char *
getcomponent(char *path, char *name)
{
    if (*path == '\0')
    return 0;
    if (*path == '/') {
    *name++ = '/';
    } else {
    do {
        *name++ = *path++;
    } while (*path != '/' && *path != '\0');
    }
    *name = '\0';
    while (*path == '/')
    path++;
    return path;
}

#ifdef UNIXWARE
/* Sigh.  The static buffer in Unixware's readdir is too small. */
struct dirent * readdir(DIR *d)
{
        static struct dirent *buf = NULL;
#define MAX_PATH_LEN 1024


        if(buf == NULL)
                buf = (struct dirent *) malloc(sizeof(struct dirent) + MAX_PATH_LEN)
;
        return(readdir_r(d, buf));
}
#endif

char *
ino2name(ino_t ino, char *dir)
{
    DIR *dp;
    struct dirent *ep;
    char *name;

    dp = opendir("..");
    if (!dp)
    fail("cannot read parent directory");
    for (;;) {
    if (!(ep = readdir(dp)))
        fail("cannot find current directory");
    if (ep->d_ino == ino)
        break;
    }
    name = xstrdup(ep->d_name);
    closedir(dp);
    return name;
}

void *
xmalloc(size_t size)
{
    void *p = malloc(size);
    if (!p)
    fail("cannot allocate %u bytes", size);
    return p;
}

char *
xstrdup(char *s)
{
    return strcpy((char*)xmalloc(strlen(s) + 1), s);
}

char *
xbasename(char *path)
{
    char *cp;

    while ((cp = strrchr(path, '/')) && cp[1] == '\0')
    *cp = '\0';
    if (!cp) return path;
    return cp + 1;
}

void
xchdir(char *dir)
{
    if (chdir(dir) < 0)
    fail("cannot change directory to %s", dir);
}

int
relatepaths(char *from, char *to, char *outpath)
{
    char *cp, *cp2;
    int len;
    char buf[NAME_MAX];

    assert(*from == '/' && *to == '/');
    for (cp = to, cp2 = from; *cp == *cp2; cp++, cp2++)
    if (*cp == '\0')
        break;
    while (cp[-1] != '/')
    cp--, cp2--;
    if (cp - 1 == to) {
    /* closest common ancestor is /, so use full pathname */
    len = strlen(strcpy(outpath, to));
    if (outpath[len] != '/') {
        outpath[len++] = '/';
        outpath[len] = '\0';
    }
    } else {
    len = 0;
    while ((cp2 = getcomponent(cp2, buf)) != 0) {
        strcpy(outpath + len, "../");
        len += 3;
    }
    while ((cp = getcomponent(cp, buf)) != 0) {
        sprintf(outpath + len, "%s/", buf);
        len += strlen(outpath + len);
    }
    }
    return len;
}

void
reversepath(char *inpath, char *name, int len, char *outpath)
{
    char *cp, *cp2;
    char buf[NAME_MAX];
    struct stat sb;

    cp = strcpy(outpath + PATH_MAX - (len + 1), name);
    cp2 = inpath;
    while ((cp2 = getcomponent(cp2, buf)) != 0) {
    if (strcmp(buf, ".") == 0)
        continue;
    if (strcmp(buf, "..") == 0) {
        if (stat(".", &sb) < 0)
        fail("cannot stat current directory");
        name = ino2name(sb.st_ino, "..");
        len = strlen(name);
        cp -= len + 1;
        strcpy(cp, name);
        cp[len] = '/';
        free(name);
        xchdir("..");
    } else {
        cp -= 3;
        strncpy(cp, "../", 3);
        xchdir(buf);
    }
    }
    strcpy(outpath, cp);
}