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Diffstat (limited to 'strbuf.c')
-rw-r--r--strbuf.c212
1 files changed, 199 insertions, 13 deletions
diff --git a/strbuf.c b/strbuf.c
index b4da9f5d05..f60e2ee72b 100644
--- a/strbuf.c
+++ b/strbuf.c
@@ -245,8 +245,8 @@ void strbuf_add_commented_lines(struct strbuf *out, const char *buf, size_t size
static char prefix2[2];
if (prefix1[0] != comment_line_char) {
- sprintf(prefix1, "%c ", comment_line_char);
- sprintf(prefix2, "%c", comment_line_char);
+ xsnprintf(prefix1, sizeof(prefix1), "%c ", comment_line_char);
+ xsnprintf(prefix2, sizeof(prefix2), "%c", comment_line_char);
}
add_lines(out, prefix1, prefix2, buf, size);
}
@@ -364,19 +364,19 @@ ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
strbuf_grow(sb, hint ? hint : 8192);
for (;;) {
- ssize_t cnt;
+ ssize_t want = sb->alloc - sb->len - 1;
+ ssize_t got = read_in_full(fd, sb->buf + sb->len, want);
- cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
- if (cnt < 0) {
+ if (got < 0) {
if (oldalloc == 0)
strbuf_release(sb);
else
strbuf_setlen(sb, oldlen);
return -1;
}
- if (!cnt)
+ sb->len += got;
+ if (got < want)
break;
- sb->len += cnt;
strbuf_grow(sb, 8192);
}
@@ -384,6 +384,17 @@ ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
return sb->len - oldlen;
}
+ssize_t strbuf_read_once(struct strbuf *sb, int fd, size_t hint)
+{
+ ssize_t cnt;
+
+ strbuf_grow(sb, hint ? hint : 8192);
+ cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
+ if (cnt > 0)
+ strbuf_setlen(sb, sb->len + cnt);
+ return cnt;
+}
+
#define STRBUF_MAXLINK (2*PATH_MAX)
int strbuf_readlink(struct strbuf *sb, const char *path, size_t hint)
@@ -435,6 +446,47 @@ int strbuf_getcwd(struct strbuf *sb)
return -1;
}
+#ifdef HAVE_GETDELIM
+int strbuf_getwholeline(struct strbuf *sb, FILE *fp, int term)
+{
+ ssize_t r;
+
+ if (feof(fp))
+ return EOF;
+
+ strbuf_reset(sb);
+
+ /* Translate slopbuf to NULL, as we cannot call realloc on it */
+ if (!sb->alloc)
+ sb->buf = NULL;
+ r = getdelim(&sb->buf, &sb->alloc, term, fp);
+
+ if (r > 0) {
+ sb->len = r;
+ return 0;
+ }
+ assert(r == -1);
+
+ /*
+ * Normally we would have called xrealloc, which will try to free
+ * memory and recover. But we have no way to tell getdelim() to do so.
+ * Worse, we cannot try to recover ENOMEM ourselves, because we have
+ * no idea how many bytes were read by getdelim.
+ *
+ * Dying here is reasonable. It mirrors what xrealloc would do on
+ * catastrophic memory failure. We skip the opportunity to free pack
+ * memory and retry, but that's unlikely to help for a malloc small
+ * enough to hold a single line of input, anyway.
+ */
+ if (errno == ENOMEM)
+ die("Out of memory, getdelim failed");
+
+ /* Restore slopbuf that we moved out of the way before */
+ if (!sb->buf)
+ strbuf_init(sb, 0);
+ return EOF;
+}
+#else
int strbuf_getwholeline(struct strbuf *sb, FILE *fp, int term)
{
int ch;
@@ -443,28 +495,54 @@ int strbuf_getwholeline(struct strbuf *sb, FILE *fp, int term)
return EOF;
strbuf_reset(sb);
- while ((ch = fgetc(fp)) != EOF) {
- strbuf_grow(sb, 1);
+ flockfile(fp);
+ while ((ch = getc_unlocked(fp)) != EOF) {
+ if (!strbuf_avail(sb))
+ strbuf_grow(sb, 1);
sb->buf[sb->len++] = ch;
if (ch == term)
break;
}
+ funlockfile(fp);
if (ch == EOF && sb->len == 0)
return EOF;
sb->buf[sb->len] = '\0';
return 0;
}
+#endif
-int strbuf_getline(struct strbuf *sb, FILE *fp, int term)
+static int strbuf_getdelim(struct strbuf *sb, FILE *fp, int term)
{
if (strbuf_getwholeline(sb, fp, term))
return EOF;
- if (sb->buf[sb->len-1] == term)
- strbuf_setlen(sb, sb->len-1);
+ if (sb->buf[sb->len - 1] == term)
+ strbuf_setlen(sb, sb->len - 1);
+ return 0;
+}
+
+int strbuf_getline(struct strbuf *sb, FILE *fp)
+{
+ if (strbuf_getwholeline(sb, fp, '\n'))
+ return EOF;
+ if (sb->buf[sb->len - 1] == '\n') {
+ strbuf_setlen(sb, sb->len - 1);
+ if (sb->len && sb->buf[sb->len - 1] == '\r')
+ strbuf_setlen(sb, sb->len - 1);
+ }
return 0;
}
+int strbuf_getline_lf(struct strbuf *sb, FILE *fp)
+{
+ return strbuf_getdelim(sb, fp, '\n');
+}
+
+int strbuf_getline_nul(struct strbuf *sb, FILE *fp)
+{
+ return strbuf_getdelim(sb, fp, '\0');
+}
+
int strbuf_getwholeline_fd(struct strbuf *sb, int fd, int term)
{
strbuf_reset(sb);
@@ -640,7 +718,7 @@ char *xstrdup_tolower(const char *string)
size_t len, i;
len = strlen(string);
- result = xmalloc(len + 1);
+ result = xmallocz(len);
for (i = 0; i < len; i++)
result[i] = tolower(string[i]);
result[i] = '\0';
@@ -665,3 +743,111 @@ char *xstrfmt(const char *fmt, ...)
return ret;
}
+
+void strbuf_addftime(struct strbuf *sb, const char *fmt, const struct tm *tm)
+{
+ size_t hint = 128;
+ size_t len;
+
+ if (!*fmt)
+ return;
+
+ strbuf_grow(sb, hint);
+ len = strftime(sb->buf + sb->len, sb->alloc - sb->len, fmt, tm);
+
+ if (!len) {
+ /*
+ * strftime reports "0" if it could not fit the result in the buffer.
+ * Unfortunately, it also reports "0" if the requested time string
+ * takes 0 bytes. So our strategy is to munge the format so that the
+ * output contains at least one character, and then drop the extra
+ * character before returning.
+ */
+ struct strbuf munged_fmt = STRBUF_INIT;
+ strbuf_addf(&munged_fmt, "%s ", fmt);
+ while (!len) {
+ hint *= 2;
+ strbuf_grow(sb, hint);
+ len = strftime(sb->buf + sb->len, sb->alloc - sb->len,
+ munged_fmt.buf, tm);
+ }
+ strbuf_release(&munged_fmt);
+ len--; /* drop munged space */
+ }
+ strbuf_setlen(sb, sb->len + len);
+}
+
+void strbuf_add_unique_abbrev(struct strbuf *sb, const unsigned char *sha1,
+ int abbrev_len)
+{
+ int r;
+ strbuf_grow(sb, GIT_SHA1_HEXSZ + 1);
+ r = find_unique_abbrev_r(sb->buf + sb->len, sha1, abbrev_len);
+ strbuf_setlen(sb, sb->len + r);
+}
+
+/*
+ * Returns the length of a line, without trailing spaces.
+ *
+ * If the line ends with newline, it will be removed too.
+ */
+static size_t cleanup(char *line, size_t len)
+{
+ while (len) {
+ unsigned char c = line[len - 1];
+ if (!isspace(c))
+ break;
+ len--;
+ }
+
+ return len;
+}
+
+/*
+ * Remove empty lines from the beginning and end
+ * and also trailing spaces from every line.
+ *
+ * Turn multiple consecutive empty lines between paragraphs
+ * into just one empty line.
+ *
+ * If the input has only empty lines and spaces,
+ * no output will be produced.
+ *
+ * If last line does not have a newline at the end, one is added.
+ *
+ * Enable skip_comments to skip every line starting with comment
+ * character.
+ */
+void strbuf_stripspace(struct strbuf *sb, int skip_comments)
+{
+ int empties = 0;
+ size_t i, j, len, newlen;
+ char *eol;
+
+ /* We may have to add a newline. */
+ strbuf_grow(sb, 1);
+
+ for (i = j = 0; i < sb->len; i += len, j += newlen) {
+ eol = memchr(sb->buf + i, '\n', sb->len - i);
+ len = eol ? eol - (sb->buf + i) + 1 : sb->len - i;
+
+ if (skip_comments && len && sb->buf[i] == comment_line_char) {
+ newlen = 0;
+ continue;
+ }
+ newlen = cleanup(sb->buf + i, len);
+
+ /* Not just an empty line? */
+ if (newlen) {
+ if (empties > 0 && j > 0)
+ sb->buf[j++] = '\n';
+ empties = 0;
+ memmove(sb->buf + j, sb->buf + i, newlen);
+ sb->buf[newlen + j++] = '\n';
+ } else {
+ empties++;
+ }
+ }
+
+ strbuf_setlen(sb, j);
+}