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-rw-r--r--lib/util/util_file.c404
1 files changed, 404 insertions, 0 deletions
diff --git a/lib/util/util_file.c b/lib/util/util_file.c
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+++ b/lib/util/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.
+ *
+ * Added afdgets() Jelmer Vernooij 2005
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "includes.h"
+#include "system/shmem.h"
+#include "system/filesys.h"
+
+/**
+ * @file
+ * @brief File-related utility functions
+ */
+
+/**
+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
+**/
+_PUBLIC_ 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 *)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;
+ /* fall through */
+ default:
+ start_of_line = false;
+ s[len++] = c;
+ s[len] = 0;
+ }
+ if (!s2 && len > maxlen-3)
+ {
+ char *t;
+
+ maxlen *= 2;
+ t = realloc_p(s, char, maxlen);
+ if (!t) {
+ DEBUG(0,("fgets_slash: failed to expand buffer!\n"));
+ SAFE_FREE(s);
+ return(NULL);
+ } else s = t;
+ }
+ }
+ return(s);
+}
+
+/**
+ * Read one line (data until next newline or eof) and allocate it
+ */
+_PUBLIC_ char *afdgets(int fd, TALLOC_CTX *mem_ctx, size_t hint)
+{
+ char *data = NULL;
+ ssize_t alloc_size = 0, offset = 0, ret;
+ int p;
+
+ if (hint <= 0) hint = 0x100;
+
+ do {
+ alloc_size += hint;
+
+ data = talloc_realloc(mem_ctx, data, char, alloc_size);
+
+ if (!data)
+ return NULL;
+
+ ret = read(fd, data + offset, hint);
+
+ if (ret == 0) {
+ return NULL;
+ }
+
+ if (ret == -1) {
+ talloc_free(data);
+ return NULL;
+ }
+
+ /* Find newline */
+ for (p = 0; p < ret; p++) {
+ if (data[offset + p] == '\n')
+ break;
+ }
+
+ if (p < ret) {
+ data[offset + p] = '\0';
+
+ /* Go back to position of newline */
+ lseek(fd, p - ret + 1, SEEK_CUR);
+ return data;
+ }
+
+ offset += ret;
+
+ } while (ret == hint);
+
+ data[offset] = '\0';
+
+ return data;
+}
+
+
+/**
+load a file into memory from a fd.
+**/
+_PUBLIC_ char *fd_load(int fd, size_t *size, TALLOC_CTX *mem_ctx)
+{
+ struct stat sbuf;
+ char *p;
+
+ if (fstat(fd, &sbuf) != 0) return NULL;
+
+ p = (char *)talloc_size(mem_ctx, sbuf.st_size+1);
+ if (!p) return NULL;
+
+ if (read(fd, p, sbuf.st_size) != sbuf.st_size) {
+ talloc_free(p);
+ return NULL;
+ }
+ p[sbuf.st_size] = 0;
+
+ if (size) *size = sbuf.st_size;
+
+ return p;
+}
+
+/**
+load a file into memory
+**/
+_PUBLIC_ char *file_load(const char *fname, size_t *size, TALLOC_CTX *mem_ctx)
+{
+ int fd;
+ char *p;
+
+ if (!fname || !*fname) return NULL;
+
+ fd = open(fname,O_RDONLY);
+ if (fd == -1) return NULL;
+
+ p = fd_load(fd, size, mem_ctx);
+
+ close(fd);
+
+ return p;
+}
+
+
+/**
+mmap (if possible) or read a file
+**/
+_PUBLIC_ void *map_file(const 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,("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,("Failed to mmap %s - %s\n", fname, strerror(errno)));
+ return NULL;
+ }
+#endif
+ if (!p) {
+ p = file_load(fname, &s2, talloc_autofree_context());
+ if (!p) return NULL;
+ if (s2 != size) {
+ DEBUG(1,("incorrect size for %s - got %d expected %d\n",
+ fname, (int)s2, (int)size));
+ talloc_free(p);
+ return NULL;
+ }
+ }
+
+ return p;
+}
+
+
+/**
+parse a buffer into lines
+'p' will be freed on error, and otherwise will be made a child of the returned array
+**/
+static char **file_lines_parse(char *p, size_t size, int *numlines, TALLOC_CTX *mem_ctx)
+{
+ int i;
+ char *s, **ret;
+
+ if (!p) return NULL;
+
+ for (s = p, i=0; s < p+size; s++) {
+ if (s[0] == '\n') i++;
+ }
+
+ ret = talloc_array(mem_ctx, char *, i+2);
+ if (!ret) {
+ talloc_free(p);
+ return NULL;
+ }
+
+ talloc_steal(ret, p);
+
+ 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 talloc_free().
+**/
+_PUBLIC_ char **file_lines_load(const char *fname, int *numlines, TALLOC_CTX *mem_ctx)
+{
+ char *p;
+ size_t size;
+
+ p = file_load(fname, &size, mem_ctx);
+ if (!p) return NULL;
+
+ return file_lines_parse(p, size, numlines, mem_ctx);
+}
+
+/**
+load a fd into memory and return an array of pointers to lines in the file
+must be freed with talloc_free(). If convert is true calls unix_to_dos on
+the list.
+**/
+_PUBLIC_ char **fd_lines_load(int fd, int *numlines, TALLOC_CTX *mem_ctx)
+{
+ char *p;
+ size_t size;
+
+ p = fd_load(fd, &size, mem_ctx);
+ if (!p) return NULL;
+
+ return file_lines_parse(p, size, numlines, mem_ctx);
+}
+
+
+/**
+take a list of lines and modify them to produce a list where \ continues
+a line
+**/
+_PUBLIC_ 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
+*/
+_PUBLIC_ bool file_save(const char *fname, const 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;
+}
+
+_PUBLIC_ int vfdprintf(int fd, const char *format, va_list ap)
+{
+ char *p;
+ int len, ret;
+ va_list ap2;
+
+ va_copy(ap2, ap);
+ len = vasprintf(&p, format, ap2);
+ va_end(ap2);
+ if (len <= 0) return len;
+ ret = write(fd, p, len);
+ SAFE_FREE(p);
+ return ret;
+}
+
+_PUBLIC_ int fdprintf(int fd, const char *format, ...)
+{
+ va_list ap;
+ int ret;
+
+ va_start(ap, format);
+ ret = vfdprintf(fd, format, ap);
+ va_end(ap);
+ return ret;
+}
+
+
+/*
+ try to determine if the filesystem supports large files
+*/
+_PUBLIC_ bool large_file_support(const char *path)
+{
+ int fd;
+ ssize_t ret;
+ char c;
+
+ fd = open(path, O_RDWR|O_CREAT, 0600);
+ unlink(path);
+ if (fd == -1) {
+ /* have to assume large files are OK */
+ return true;
+ }
+ ret = pread(fd, &c, 1, ((uint64_t)1)<<32);
+ close(fd);
+ return ret == 0;
+}
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