lib/util_file.c

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/*
 * Unix SMB/CIFS implementation.
 * SMB parameters and setup
 * Copyright (C) Andrew Tridgell 1992-1998 Modified by Jeremy Allison 1995.
 * 
 * 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., 675
 * Mass Ave, Cambridge, MA 02139, USA.
 */

#include "includes.h"

#ifndef MAP_FAILED
#define MAP_FAILED ((void *)-1)
#endif

/****************************************************************************
 Read a line from a file with possible \ continuation chars. 
 Blanks at the start or end of a line are stripped.
 The string will be allocated if s2 is NULL.
****************************************************************************/

char *fgets_slash(char *s2,int maxlen,XFILE *f)
{
        char *s=s2;
        int len = 0;
        int c;
        BOOL start_of_line = True;

        if (x_feof(f)) {
                return(NULL);
        }

        if (maxlen <2) {
                return(NULL);
        }

        if (!s2) {
                maxlen = MIN(maxlen,8);
                s = (char *)SMB_MALLOC(maxlen);
        }

        if (!s) {
                return(NULL);
        }

        *s = 0;

        while (len < maxlen-1) {
                c = x_getc(f);
                switch (c) {
                        case '\r':
                                break;
                        case '\n':
                                while (len > 0 && s[len-1] == ' ') {
                                        s[--len] = 0;
                                }
                                if (len > 0 && s[len-1] == '\\') {
                                        s[--len] = 0;
                                        start_of_line = True;
                                        break;
                                }
                                return(s);
                        case EOF:
                                if (len <= 0 && !s2)  {
                                        SAFE_FREE(s);
                                }
                                return(len>0?s:NULL);
                        case ' ':
                                if (start_of_line) {
                                        break;
                                }
                        default:
                                start_of_line = False;
                                s[len++] = c;
                                s[len] = 0;
                }

                if (!s2 && len > maxlen-3) {
                        maxlen *= 2;
                        s = (char *)SMB_REALLOC(s,maxlen);
                        if (!s) {
                                DEBUG(0,("fgets_slash: failed to expand buffer!\n"));
                                return(NULL);
                        }
                }
        }
        return(s);
}

/****************************************************************************
 Load from a pipe into memory.
****************************************************************************/

char *file_pload(char *syscmd, size_t *size)
{
        int fd, n;
        char *p;
        pstring buf;
        size_t total;
        
        fd = sys_popen(syscmd);
        if (fd == -1) {
                return NULL;
        }

        p = NULL;
        total = 0;

        while ((n = read(fd, buf, sizeof(buf))) > 0) {
                p = (char *)SMB_REALLOC(p, total + n + 1);
                if (!p) {
                        DEBUG(0,("file_pload: failed to expand buffer!\n"));
                        close(fd);
                        return NULL;
                }
                memcpy(p+total, buf, n);
                total += n;
        }

        if (p) {
                p[total] = 0;
        }

        /* FIXME: Perhaps ought to check that the command completed
         * successfully (returned 0); if not the data may be
         * truncated. */
        sys_pclose(fd);

        if (size) {
                *size = total;
        }

        return p;
}

/****************************************************************************
 Load a file into memory from a fd.
 Truncate at maxsize. If maxsize == 0 - no limit.
****************************************************************************/ 

char *fd_load(int fd, size_t *psize, size_t maxsize)
{
        SMB_STRUCT_STAT sbuf;
        size_t size;
        char *p;

        if (sys_fstat(fd, &sbuf) != 0) {
                return NULL;
        }

        size = sbuf.st_size;
        if (maxsize) {
                size = MIN(size, maxsize);
        }

        p = (char *)SMB_MALLOC(size+1);
        if (!p) {
                return NULL;
        }

        if (read(fd, p, size) != size) {
                SAFE_FREE(p);
                return NULL;
        }
        p[size] = 0;

        if (psize) {
                *psize = size;
        }

        return p;
}

/****************************************************************************
 Load a file into memory.
****************************************************************************/

char *file_load(const char *fname, size_t *size, size_t maxsize)
{
        int fd;
        char *p;

        if (!fname || !*fname) {
                return NULL;
        }
        
        fd = open(fname,O_RDONLY);
        if (fd == -1) {
                return NULL;
        }

        p = fd_load(fd, size, maxsize);
        close(fd);
        return p;
}

/*******************************************************************
 unmap or free memory
*******************************************************************/

BOOL unmap_file(void* start, size_t size)
{
#ifdef HAVE_MMAP
        if ( munmap( start, size ) != 0 ) {
                DEBUG( 1, ("map_file: Failed to unmap address %p "
                        "of size %u - %s\n", 
                        start, (unsigned int)size, strerror(errno) ));
                return False;
        }
        return True;
#else
        SAFE_FREE( start );
        return True;
#endif
}

/*******************************************************************
 mmap (if possible) or read a file.
********************************************************************/

void *map_file(char *fname, size_t size)
{
        size_t s2 = 0;
        void *p = NULL;
#ifdef HAVE_MMAP
        int fd;
        fd = open(fname, O_RDONLY, 0);
        if (fd == -1) {
                DEBUG(2,("map_file: Failed to load %s - %s\n", fname, strerror(errno)));
                return NULL;
        }
        p = mmap(NULL, size, PROT_READ, MAP_SHARED|MAP_FILE, fd, 0);
        close(fd);
        if (p == MAP_FAILED) {
                DEBUG(1,("map_file: Failed to mmap %s - %s\n", fname, strerror(errno)));
                return NULL;
        }
#endif
        if (!p) {
                p = file_load(fname, &s2, 0);
                if (!p) {
                        return NULL;
                }
                if (s2 != size) {
                        DEBUG(1,("map_file: incorrect size for %s - got %lu expected %lu\n",
                                 fname, (unsigned long)s2, (unsigned long)size));
                        SAFE_FREE(p);   
                        return NULL;
                }
        }
        return p;
}

/****************************************************************************
 Parse a buffer into lines.
****************************************************************************/

static char **file_lines_parse(char *p, size_t size, int *numlines)
{
        int i;
        char *s, **ret;

        if (!p) {
                return NULL;
        }

        for (s = p, i=0; s < p+size; s++) {
                if (s[0] == '\n') i++;
        }

        ret = SMB_MALLOC_ARRAY(char *, i+2);
        if (!ret) {
                SAFE_FREE(p);
                return NULL;
        }       
        memset(ret, 0, sizeof(ret[0])*(i+2));

        ret[0] = p;
        for (s = p, i=0; s < p+size; s++) {
                if (s[0] == '\n') {
                        s[0] = 0;
                        i++;
                        ret[i] = s+1;
                }
                if (s[0] == '\r') {
                        s[0] = 0;
                }
        }

        /* remove any blank lines at the end */
        while (i > 0 && ret[i-1][0] == 0) {
                i--;
        }

        if (numlines) {
                *numlines = i;
        }

        return ret;
}

/****************************************************************************
 Load a file into memory and return an array of pointers to lines in the file
 must be freed with file_lines_free(). 
****************************************************************************/

char **file_lines_load(const char *fname, int *numlines, size_t maxsize)
{
        char *p;
        size_t size = 0;

        p = file_load(fname, &size, maxsize);
        if (!p) {
                return NULL;
        }

        return file_lines_parse(p, size, numlines);
}

/****************************************************************************
 Load a fd into memory and return an array of pointers to lines in the file
 must be freed with file_lines_free(). If convert is true calls unix_to_dos on
 the list.
****************************************************************************/

char **fd_lines_load(int fd, int *numlines, size_t maxsize)
{
        char *p;
        size_t size;

        p = fd_load(fd, &size, maxsize);
        if (!p) {
                return NULL;
        }

        return file_lines_parse(p, size, numlines);
}

/****************************************************************************
 Load a pipe into memory and return an array of pointers to lines in the data
 must be freed with file_lines_free(). 
****************************************************************************/

char **file_lines_pload(char *syscmd, int *numlines)
{
        char *p;
        size_t size;

        p = file_pload(syscmd, &size);
        if (!p) {
                return NULL;
        }

        return file_lines_parse(p, size, numlines);
}

/****************************************************************************
 Free lines loaded with file_lines_load.
****************************************************************************/

void file_lines_free(char **lines)
{
        if (!lines) {
                return;
        }
        SAFE_FREE(lines[0]);
        SAFE_FREE(lines);
}

/****************************************************************************
 Take a list of lines and modify them to produce a list where \ continues
 a line.
****************************************************************************/

void file_lines_slashcont(char **lines)
{
        int i, j;

        for (i=0; lines[i];) {
                int len = strlen(lines[i]);
                if (lines[i][len-1] == '\\') {
                        lines[i][len-1] = ' ';
                        if (lines[i+1]) {
                                char *p = &lines[i][len];
                                while (p < lines[i+1]) {
                                        *p++ = ' ';
                                }
                                for (j = i+1; lines[j]; j++) {
                                        lines[j] = lines[j+1];
                                }
                        }
                } else {
                        i++;
                }
        }
}

/****************************************************************************
 Save a lump of data into a file. Mostly used for debugging.
****************************************************************************/

BOOL file_save(const char *fname, void *packet, size_t length)
{
        int fd;
        fd = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0644);
        if (fd == -1) {
                return False;
        }
        if (write(fd, packet, length) != (size_t)length) {
                return False;
        }
        close(fd);
        return True;
}

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