diff options
Diffstat (limited to 'file_util.c')
| -rw-r--r-- | file_util.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/file_util.c b/file_util.c new file mode 100644 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; +} + |