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patch: fix vda's thinko: we need to open new_filename.orig, always!

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plug memory leak; add testsuite

patch_main                                          1009     988     -21
This commit is contained in:
Denis Vlasenko 2008-03-25 14:15:39 +00:00
parent 80591b0a00
commit cc2965fd23
2 changed files with 59 additions and 18 deletions
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30
editors/patch.c
View File

@ -87,7 +87,7 @@ int patch_main(int argc ATTRIBUTE_UNUSED, char **argv)
while (patch_line) {
FILE *src_stream;
FILE *dst_stream;
char *original_filename;
//char *old_filename;
char *new_filename;
char *backup_filename;
unsigned src_cur_line = 1;
@ -102,10 +102,12 @@ int patch_main(int argc ATTRIBUTE_UNUSED, char **argv)
*/
do {
/* Extract the filename used before the patch was generated */
original_filename = extract_filename(patch_line, patch_level, "--- ");
new_filename = extract_filename(patch_line, patch_level, "--- ");
// was old_filename above
patch_line = xmalloc_getline(patch_file);
if (!patch_line) goto quit;
} while (!original_filename);
} while (!new_filename);
free(new_filename); // "source" filename is irrelevant
new_filename = extract_filename(patch_line, patch_level, "+++ ");
if (!new_filename) {
@ -122,25 +124,15 @@ int patch_main(int argc ATTRIBUTE_UNUSED, char **argv)
*slash = '/';
}
backup_filename = NULL;
src_stream = NULL;
saved_stat.st_mode = 0644;
} else {
backup_filename = xasprintf("%s.orig", new_filename);
xrename(new_filename, backup_filename);
src_stream = xfopen(backup_filename, "r");
}
dst_stream = xfopen(new_filename, "w");
fchmod(fileno(dst_stream), saved_stat.st_mode);
src_stream = NULL;
if (backup_filename && stat(original_filename, &saved_stat) == 0) {
// strcmp() is never 0! Otherwise:
// original_filename == new_filename,
// stat(original_filename) == stat(new_filename),
// stat(new_filename) == 0,
// but we renamed new_filename if it existed!
// stat() must fail!
//src_stream = xfopen((strcmp(original_filename, new_filename)) ?
// original_filename : backup_filename, "r");
src_stream = xfopen(original_filename, "r");
}
printf("patching file %s\n", new_filename);
@ -224,15 +216,17 @@ int patch_main(int argc ATTRIBUTE_UNUSED, char **argv)
/* It worked, we can remove the backup */
if (backup_filename) {
unlink(backup_filename);
free(backup_filename);
}
if ((dest_cur_line == 0) || (dest_beg_line == 0)) {
/* The new patched file is empty, remove it */
xunlink(new_filename);
/* original_filename and new_filename may be the same file */
unlink(original_filename);
// /* old_filename and new_filename may be the same file */
// unlink(old_filename);
}
}
free(backup_filename);
//free(old_filename);
free(new_filename);
} /* end of "while there are patch lines" */
quit:

47
testsuite/patch.tests Executable file
View File

@ -0,0 +1,47 @@
#!/bin/sh
# Copyright 2008 by Denys Vlasenko
# Licensed under GPL v2, see file LICENSE for details.
. testing.sh
# testing "test name" "options" "expected result" "file input" "stdin"
testing "patch with old_file == new_file" \
"patch; echo $?; cat input" \
"\
patching file input
0
qwe
asd
zxc
" \
"qwe\nzxc\n" \
"\
--- input Jan 01 01:01:01 2000
+++ input Jan 01 01:01:01 2000
@@ -1,2 +1,3 @@
qwe
+asd
zxc
" \
testing "patch with nonexistent old_file" \
"strace -o zzz patch; echo $?; cat input" \
"\
patching file input
0
qwe
asd
zxc
" \
"qwe\nzxc\n" \
"\
--- input.doesnt_exist Jan 01 01:01:01 2000
+++ input Jan 01 01:01:01 2000
@@ -1,2 +1,3 @@
qwe
+asd
zxc
" \
exit $FAILCOUNT