undef/git-commit-vandalism
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

imap-send.c: simplify logic in lf_to_crlf()

Browse Source 
* 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>
This commit is contained in:
Michael Haggerty 2013-01-15 09:06:32 +01:00 committed by Junio C Hamano
parent 636fd66bc1
commit 3691031cb3
1 changed files with 22 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

50
imap-send.c
View File

@ -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;
size_t i, j;
char lastc;
if (msg->buf[0] == '\n')
lfnum++;
for (i = 1; i < msg->len; i++) {
if (msg->buf[i - 1] != '\r' && msg->buf[i] == '\n')
lfnum++;
/* 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);
}
/*