* Add ipkg for future development

[oweals/opkg-lede.git] / file_util.c

diff --git a/file_util.c b/file_util.c
new file mode 100644 (file)
index 0000000..e8084dd
--- /dev/null
+++ b/file_util.c
@@ -0,0 +1,177 @@
+/* file_util.c - convenience routines for common stat operations
+
+   Carl D. Worth
+
+   Copyright (C) 2001 University of Southern California
+
+   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, 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.
+*/
+
+#include "ipkg.h"
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include "sprintf_alloc.h"
+#include "file_util.h"
+#include "md5.h"
+#include "libbb/libbb.h"
+#undef strlen
+
+int file_exists(const char *file_name)
+{
+    int err;
+    struct stat stat_buf;
+
+    err = stat(file_name, &stat_buf);
+    if (err == 0) {
+       return 1;
+    } else {
+       return 0;
+    }
+}
+
+int file_is_dir(const char *file_name)
+{
+    int err;
+    struct stat stat_buf;
+
+    err = stat(file_name, &stat_buf);
+    if (err) {
+       return 0;
+    }
+
+    return S_ISDIR(stat_buf.st_mode);
+}
+
+/* read a single line from a file, stopping at a newline or EOF.
+   If a newline is read, it will appear in the resulting string.
+   Return value is a malloc'ed char * which should be freed at
+   some point by the caller.
+
+   Return value is NULL if the file is at EOF when called.
+*/
+#define FILE_READ_LINE_BUF_SIZE 1024
+char *file_read_line_alloc(FILE *file)
+{
+    char buf[FILE_READ_LINE_BUF_SIZE];
+    int buf_len;
+    char *line = NULL;
+    int line_size = 0;
+
+    memset(buf, 0, FILE_READ_LINE_BUF_SIZE);
+    while (fgets(buf, FILE_READ_LINE_BUF_SIZE, file)) {
+       buf_len = strlen(buf);
+       if (line) {
+           line_size += buf_len;
+           line = realloc(line, line_size);
+           if (line == NULL) {
+               fprintf(stderr, "%s: out of memory\n", __FUNCTION__);
+               break;
+           }
+           strcat(line, buf);
+       } else {
+           line_size = buf_len + 1;
+           line = strdup(buf);
+       }
+       if (buf[buf_len - 1] == '\n') {
+           break;
+       }
+    }
+
+    return line;
+}
+
+int file_move(const char *src, const char *dest)
+{
+    int err;
+
+    err = rename(src, dest);
+
+    if (err && errno == EXDEV) {
+       err = file_copy(src, dest);
+       unlink(src);
+    } else if (err) {
+       fprintf(stderr, "%s: ERROR: failed to rename %s to %s: %s\n",
+               __FUNCTION__, src, dest, strerror(errno));
+    }
+
+    return err;
+}
+
+/* I put these here to keep libbb dependencies from creeping all over
+   the ipkg code */
+int file_copy(const char *src, const char *dest)
+{
+    int err;
+
+    err = copy_file(src, dest, FILEUTILS_FORCE | FILEUTILS_PRESERVE_STATUS);
+    if (err) {
+       fprintf(stderr, "%s: ERROR: failed to copy %s to %s\n",
+               __FUNCTION__, src, dest);
+    }
+
+    return err;
+}
+
+int file_mkdir_hier(const char *path, long mode)
+{
+    return make_directory(path, mode, FILEUTILS_RECUR);
+}
+
+char *file_md5sum_alloc(const char *file_name)
+{
+    static const int md5sum_bin_len = 16;
+    static const int md5sum_hex_len = 32;
+
+    static const unsigned char bin2hex[16] = {
+       '0', '1', '2', '3',
+       '4', '5', '6', '7',
+       '8', '9', 'a', 'b',
+       'c', 'd', 'e', 'f'
+    };
+
+    int i, err;
+    FILE *file;
+    unsigned char *md5sum_hex;
+    unsigned char md5sum_bin[md5sum_bin_len];
+
+    md5sum_hex = malloc(md5sum_hex_len + 1);
+    if (md5sum_hex == NULL) {
+       fprintf(stderr, "%s: out of memory\n", __FUNCTION__);
+       return strdup("");
+    }
+
+    file = fopen(file_name, "r");
+    if (file == NULL) {
+       fprintf(stderr, "%s: Failed to open file %s: %s\n",
+               __FUNCTION__, file_name, strerror(errno));
+       return strdup("");
+    }
+
+    err = md5_stream(file, md5sum_bin);
+    if (err) {
+       fprintf(stderr, "%s: ERROR computing md5sum for %s: %s\n",
+               __FUNCTION__, file_name, strerror(err));
+       return strdup("");
+    }
+
+    fclose(file);
+
+    for (i=0; i < md5sum_bin_len; i++) {
+       md5sum_hex[i*2] = bin2hex[md5sum_bin[i] >> 4];
+       md5sum_hex[i*2+1] = bin2hex[md5sum_bin[i] & 0xf];
+    }
+    
+    md5sum_hex[md5sum_hex_len] = '\0';
+    
+    return md5sum_hex;
+}
+