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Fix some bugs in in-place editing:

Browse Source 
(1) errors from freopen were not reported correctly
(2) large files were not handled correctly
(3) read-only files broke things

MFC after:	1 week
This commit is contained in:
Tony Finch 2002-07-30 19:42:18 +00:00
parent b69ed3f4c6
commit d1691a2ff6
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=100970
1 changed files with 26 additions and 28 deletions
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54
usr.bin/sed/main.c
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@ -413,9 +413,7 @@ inplace_edit(filename)
char **filename;
{
struct stat orig;
int input, output;
char backup[MAXPATHLEN];
char *buffer;
if (lstat(*filename, &orig) == -1)
err(1, "lstat");
@ -425,36 +423,36 @@ inplace_edit(filename)
}
if (*inplace == '\0') {
char template[] = "/tmp/sed.XXXXXXXXXX";
output = mkstemp(template);
if (output == -1)
err(1, "mkstemp");
strlcpy(backup, template, MAXPATHLEN);
/*
* This is a bit of a hack: we use mkstemp() to avoid the
* mktemp() link-time warning, although mktemp() would fit in
* this context much better. We're only interested in getting
* a name for use in the rename(); there aren't any security
* issues here that don't already exist in relation to the
* original file and its directory.
*/
int fd;
strlcpy(backup, *filename, sizeof(backup));
strlcat(backup, ".XXXXXXXXXX", sizeof(backup));
fd = mkstemp(backup);
if (fd == -1)
errx(1, "could not create backup of %s", *filename);
else
close(fd);
} else {
strlcpy(backup, *filename, MAXPATHLEN);
strlcat(backup, inplace, MAXPATHLEN);
output = open(backup, O_WRONLY | O_CREAT | O_TRUNC);
if (output == -1)
err(1, "open(%s)", backup);
strlcpy(backup, *filename, sizeof(backup));
strlcat(backup, inplace, sizeof(backup));
}
input = open(*filename, O_RDONLY);
if (input == -1)
err(1, "open(%s)", *filename);
if (fchmod(output, orig.st_mode & ~S_IFMT) == -1)
err(1, "chmod");
buffer = (char *)mmap(0, orig.st_size, PROT_READ, MAP_SHARED, input, 0);
if (buffer == MAP_FAILED)
err(1, "mmap(%s)", *filename);
if (write(output, buffer, orig.st_size) == -1)
err(1, "write(%s)", backup);
if (munmap(buffer, orig.st_size) == -1)
err(1, "munmap(%s)", *filename);
close(input);
close(output);
freopen(*filename, "w", stdout);
if (rename(*filename, backup) == -1)
err(1, "rename(\"%s\", \"%s\")", *filename, backup);
if (freopen(*filename, "w", stdout) == NULL)
err(1, "open(\"%s\")", *filename);
if (fchmod(fileno(stdout), orig.st_mode) == -1)
err(1, "chmod(\"%s\")", *filename);
*filename = strdup(backup);
if (*filename == NULL)
err(1, "malloc");
return 0;
}