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Overhauled demo/demo -iso_cat. Better error messages. Closed memory leaks.

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Instigated by Coverity CID 12555.
This commit is contained in:
Thomas Schmitt
2015-10-12 14:14:14 +02:00
parent cb1e56478a
commit 6252ae2065
1 changed files with 65 additions and 31 deletions
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96
demo/demo.c
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@ -1,6 +1,6 @@
/*
* Copyright (c) 2007 - 2014 Vreixo Formoso, Thomas Schmitt
* Copyright (c) 2007 - 2015 Vreixo Formoso, Thomas Schmitt
*
* This file is part of the libisofs project; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2
@ -58,6 +58,22 @@ static char helptext[][80] = {
#endif
/* ----------------------------- utilities -------------------------- */
void demo_report_iso_err(int err, char *occasion)
{
char *severity;
fprintf(stderr, "%s : err = 0x%X", occasion, (unsigned int) err);
if (err < 0) {
iso_sev_to_text(iso_error_get_severity(err), &severity);
fprintf(stderr, " -> %s '%s'", severity, iso_error_to_msg(err));
}
fprintf(stderr, "\n");
}
/* ------------------------- from demo/tree.c ----------------------- */
static void
@ -544,12 +560,12 @@ int gesture_iso_read(int argc, char **argv)
int gesture_iso_cat(int argc, char **argv)
{
int res, write_ret;
IsoFilesystem *fs;
IsoFileSource *file;
int res, write_ret, ret;
IsoFilesystem *fs = NULL;
IsoFileSource *file = NULL;
struct stat info;
IsoDataSource *src;
IsoReadOpts *opts;
IsoDataSource *src = NULL;
IsoReadOpts *opts = NULL;
if (argc != 3) {
fprintf(stderr, "Usage: -iso_cat /path/to/image /path/to/file\n");
@ -558,69 +574,87 @@ int gesture_iso_cat(int argc, char **argv)
res = iso_init();
if (res < 0) {
fprintf(stderr, "Can't init libisofs\n");
demo_report_iso_err(res, "Cannot init libisofs");
return 1;
}
/* Important Note:
From here on memory objects get created which need to be freed in
the end. Therefore in case of problems no direct return, but rather
a hop to label "ex:", where cleanup happens.
*/
res = iso_data_source_new_from_file(argv[1], &src);
if (res < 0) {
fprintf(stderr, "Error creating data source\n");
return 1;
demo_report_iso_err(res, "Error creating data source object");
ret = 1; goto ex;
}
res = iso_read_opts_new(&opts, 0);
if (res < 0) {
fprintf(stderr, "Error creating read options\n");
return 1;
demo_report_iso_err(res, "Error creating read options object");
ret = 1; goto ex;
}
res = iso_image_filesystem_new(src, opts, 1, &fs);
if (res < 0) {
fprintf(stderr, "Error creating filesystem\n");
return 1;
demo_report_iso_err(res, "Error creating filesystem object");
ret = 1; goto ex;
}
iso_read_opts_free(opts);
opts = NULL;
res = fs->get_by_path(fs, argv[2], &file);
if (res < 0) {
fprintf(stderr, "Can't get file, err = %d\n", res);
return 1;
demo_report_iso_err(res, "Cannot get file object with given path");
ret = 1; goto ex;
}
res = iso_file_source_lstat(file, &info);
if (res < 0) {
fprintf(stderr, "Can't stat file, err = %d\n", res);
return 1;
demo_report_iso_err(res,
"Cannot inquire type of file object with given path");
ret = 1; goto ex;
}
if (S_ISDIR(info.st_mode)) {
fprintf(stderr, "Path refers to a directory!!\n");
return 1;
ret = 1; goto ex;
} else {
char buf[1024];
res = iso_file_source_open(file);
if (res < 0) {
fprintf(stderr, "Can't open file, err = %d\n", res);
return 1;
demo_report_iso_err(res,
"Cannot open file object with given path");
ret = 1; goto ex;
}
while ((res = iso_file_source_read(file, buf, 1024)) > 0) {
write_ret = fwrite(buf, 1, res, stdout);
if (write_ret < res) {
printf ("Cannot write block to stdout. errno= %d\n", errno);
return 1;
iso_file_source_close(file);
ret = 1; goto ex;
}
}
if (res < 0) {
fprintf(stderr, "Error reading, err = %d\n", res);
return 1;
}
iso_file_source_close(file);
if (res < 0) {
demo_report_iso_err(res, "Error while reading data content");
fprintf(stderr, "Error reading, err = 0x%X\n", (unsigned int) res);
ret = 1; goto ex;
}
}
iso_file_source_unref(file);
iso_filesystem_unref(fs);
iso_data_source_unref(src);
ret = 0;
ex:;
if (file != NULL)
iso_file_source_unref(file);
if (fs != NULL)
iso_filesystem_unref(fs);
if (opts != NULL)
iso_read_opts_free(opts);
if (src != NULL)
iso_data_source_unref(src);
iso_finish();
return 0;
return ret;
}