In many parts of the code, we do an ugly and error-prone
malloc like:
const char *fmt = "something %s";
buf = xmalloc(strlen(foo) + 10 + 1);
sprintf(buf, fmt, foo);
This makes the code brittle, and if we ever get the
allocation wrong, is a potential heap overflow. Let's
instead favor xstrdup_fmt, which handles the allocation
automatically, and makes the code shorter and more readable.
Signed-off-by: Jeff King <p...@peff.net>
---
remote.c | 6 +-----
unpack-trees.c | 17 ++++++-----------
2 files changed, 7 insertions(+), 16 deletions(-)
diff --git a/remote.c b/remote.c
index 0e9459c..792dcee 100644
--- a/remote.c
+++ b/remote.c
@@ -170,7 +170,6 @@ static struct branch *make_branch(const char *name, int len)
{
struct branch *ret;
int i;
- char *refname;
for (i = 0; i < branches_nr; i++) {
if (len ? (!strncmp(name, branches[i]->name, len) &&
@@ -186,10 +185,7 @@ static struct branch *make_branch(const char *name, int
len)
ret->name = xstrndup(name, len);
else
ret->name = xstrdup(name);
- refname = xmalloc(strlen(name) + strlen("refs/heads/") + 1);
- strcpy(refname, "refs/heads/");
- strcpy(refname + strlen("refs/heads/"), ret->name);
- ret->refname = refname;
+ ret->refname = xstrdup_fmt("refs/heads/%s", ret->name);
return ret;
}
diff --git a/unpack-trees.c b/unpack-trees.c
index 97fc995..dd1e06e 100644
--- a/unpack-trees.c
+++ b/unpack-trees.c
@@ -56,17 +56,15 @@ void setup_unpack_trees_porcelain(struct
unpack_trees_options *opts,
int i;
const char **msgs = opts->msgs;
const char *msg;
- char *tmp;
const char *cmd2 = strcmp(cmd, "checkout") ? cmd : "switch branches";
+
if (advice_commit_before_merge)
msg = "Your local changes to the following files would be
overwritten by %s:\n%%s"
"Please, commit your changes or stash them before you
can %s.";
else
msg = "Your local changes to the following files would be
overwritten by %s:\n%%s";
- tmp = xmalloc(strlen(msg) + strlen(cmd) + strlen(cmd2) - 2);
- sprintf(tmp, msg, cmd, cmd2);
- msgs[ERROR_WOULD_OVERWRITE] = tmp;
- msgs[ERROR_NOT_UPTODATE_FILE] = tmp;
+ msgs[ERROR_WOULD_OVERWRITE] = msgs[ERROR_NOT_UPTODATE_FILE] =
+ xstrdup_fmt(msg, cmd, cmd2);
msgs[ERROR_NOT_UPTODATE_DIR] =
"Updating the following directories would lose untracked files
in it:\n%s";
@@ -76,12 +74,9 @@ void setup_unpack_trees_porcelain(struct
unpack_trees_options *opts,
"Please move or remove them before you can %s.";
else
msg = "The following untracked working tree files would be %s
by %s:\n%%s";
- tmp = xmalloc(strlen(msg) + strlen(cmd) + strlen("removed") +
strlen(cmd2) - 4);
- sprintf(tmp, msg, "removed", cmd, cmd2);
- msgs[ERROR_WOULD_LOSE_UNTRACKED_REMOVED] = tmp;
- tmp = xmalloc(strlen(msg) + strlen(cmd) + strlen("overwritten") +
strlen(cmd2) - 4);
- sprintf(tmp, msg, "overwritten", cmd, cmd2);
- msgs[ERROR_WOULD_LOSE_UNTRACKED_OVERWRITTEN] = tmp;
+
+ msgs[ERROR_WOULD_LOSE_UNTRACKED_REMOVED] = xstrdup_fmt(msg, "removed",
cmd, cmd2);
+ msgs[ERROR_WOULD_LOSE_UNTRACKED_OVERWRITTEN] = xstrdup_fmt(msg,
"overwritten", cmd, cmd2);
/*
* Special case: ERROR_BIND_OVERLAP refers to a pair of paths, we
--
2.0.0.566.gfe3e6b2
--
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