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authorMichael Haggerty <mhagger@alum.mit.edu>2013-01-15 09:06:32 +0100
committerJunio C Hamano <gitster@pobox.com>2013-01-15 14:50:23 -0800
commit3691031cb33922ce49448518aa06e33eded3368e (patch)
treed121fd0f000eddec28091fd7a9b0878a0e74b68b /imap-send.c
parent636fd66bc18d7563b9260485a9974da67a805514 (diff)
downloadgit-3691031cb33922ce49448518aa06e33eded3368e.tar.gz
git-3691031cb33922ce49448518aa06e33eded3368e.tar.xz
imap-send.c: simplify logic in lf_to_crlf()
* The first character in the string used to be special-cased to get around the fact that msg->buf[i - 1] is not defined for i == 0. Instead, keep track of the previous character in a separate variable, "lastc", initialized in such a way to let the loop handle i == 0 correctly. * Make the two loops over the string look as similar as possible to make it more obvious that the count computed in the first pass agrees with the true length of the new string written in the second pass. As a side effect, this makes it possible to use the "j" counter in place of lfnum and new_len. Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu> Reviewed-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'imap-send.c')
-rw-r--r--imap-send.c52
1 files changed, 23 insertions, 29 deletions
diff --git a/imap-send.c b/imap-send.c
index 60cbf6b80..21dc20b57 100644
--- a/imap-send.c
+++ b/imap-send.c
@@ -1091,42 +1091,36 @@ bail:
return NULL;
}
+/*
+ * Insert CR characters as necessary in *msg to ensure that every LF
+ * character in *msg is preceded by a CR.
+ */
static void lf_to_crlf(struct strbuf *msg)
{
- size_t new_len;
char *new;
- int i, j, lfnum = 0;
-
- if (msg->buf[0] == '\n')
- lfnum++;
- for (i = 1; i < msg->len; i++) {
- if (msg->buf[i - 1] != '\r' && msg->buf[i] == '\n')
- lfnum++;
+ size_t i, j;
+ char lastc;
+
+ /* First pass: tally, in j, the size of the new string: */
+ for (i = j = 0, lastc = '\0'; i < msg->len; i++) {
+ if (msg->buf[i] == '\n' && lastc != '\r')
+ j++; /* a CR will need to be added here */
+ lastc = msg->buf[i];
+ j++;
}
- new_len = msg->len + lfnum;
- new = xmalloc(new_len + 1);
- if (msg->buf[0] == '\n') {
- new[0] = '\r';
- new[1] = '\n';
- i = 1;
- j = 2;
- } else {
- new[0] = msg->buf[0];
- i = 1;
- j = 1;
- }
- for ( ; i < msg->len; i++) {
- if (msg->buf[i] != '\n') {
- new[j++] = msg->buf[i];
- continue;
- }
- if (msg->buf[i - 1] != '\r')
+ new = xmalloc(j + 1);
+
+ /*
+ * Second pass: write the new string. Note that this loop is
+ * otherwise identical to the first pass.
+ */
+ for (i = j = 0, lastc = '\0'; i < msg->len; i++) {
+ if (msg->buf[i] == '\n' && lastc != '\r')
new[j++] = '\r';
- /* otherwise it already had CR before */
- new[j++] = '\n';
+ lastc = new[j++] = msg->buf[i];
}
- strbuf_attach(msg, new, new_len, new_len + 1);
+ strbuf_attach(msg, new, j, j + 1);
}
/*