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diff --git a/strbuf.c b/strbuf.c
index 7136de14c63b0a93c271156fcef86ca26cecea7a..f4201e160de2ccb9f2d9adef695c73a124e676d5 100644 (file)
--- a/strbuf.c
+++ b/strbuf.c
#include "cache.h"
-#include "strbuf.h"
-void strbuf_init(struct strbuf *sb) {
- memset(sb, 0, sizeof(*sb));
-}
+/*
+ * Used as the default ->buf value, so that people can always assume
+ * buf is non NULL and ->buf is NUL terminated even for a freshly
+ * initialized strbuf.
+ */
+char strbuf_slopbuf[1];
-void strbuf_release(struct strbuf *sb) {
- free(sb->buf);
- memset(sb, 0, sizeof(*sb));
+void strbuf_init(struct strbuf *sb, size_t hint)
+{
+ sb->alloc = sb->len = 0;
+ sb->buf = strbuf_slopbuf;
+ if (hint)
+ strbuf_grow(sb, hint);
}
-void strbuf_reset(struct strbuf *sb) {
- if (sb->len)
- strbuf_setlen(sb, 0);
- sb->eof = 0;
+void strbuf_release(struct strbuf *sb)
+{
+ if (sb->alloc) {
+ free(sb->buf);
+ strbuf_init(sb, 0);
+ }
}
-char *strbuf_detach(struct strbuf *sb) {
- char *res = sb->buf;
- strbuf_init(sb);
+char *strbuf_detach(struct strbuf *sb, size_t *sz)
+{
+ char *res = sb->alloc ? sb->buf : NULL;
+ if (sz)
+ *sz = sb->len;
+ strbuf_init(sb, 0);
return res;
}
-void strbuf_grow(struct strbuf *sb, size_t extra) {
+void strbuf_attach(struct strbuf *sb, void *buf, size_t len, size_t alloc)
+{
+ strbuf_release(sb);
+ sb->buf = buf;
+ sb->len = len;
+ sb->alloc = alloc;
+ strbuf_grow(sb, 0);
+ sb->buf[sb->len] = '\0';
+}
+
+void strbuf_grow(struct strbuf *sb, size_t extra)
+{
if (sb->len + extra + 1 <= sb->len)
die("you want to use way too much memory");
+ if (!sb->alloc)
+ sb->buf = NULL;
ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
}
-void strbuf_add(struct strbuf *sb, const void *data, size_t len) {
+void strbuf_rtrim(struct strbuf *sb)
+{
+ while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
+ sb->len--;
+ sb->buf[sb->len] = '\0';
+}
+
+int strbuf_cmp(struct strbuf *a, struct strbuf *b)
+{
+ int cmp;
+ if (a->len < b->len) {
+ cmp = memcmp(a->buf, b->buf, a->len);
+ return cmp ? cmp : -1;
+ } else {
+ cmp = memcmp(a->buf, b->buf, b->len);
+ return cmp ? cmp : a->len != b->len;
+ }
+}
+
+void strbuf_splice(struct strbuf *sb, size_t pos, size_t len,
+ const void *data, size_t dlen)
+{
+ if (pos + len < pos)
+ die("you want to use way too much memory");
+ if (pos > sb->len)
+ die("`pos' is too far after the end of the buffer");
+ if (pos + len > sb->len)
+ die("`pos + len' is too far after the end of the buffer");
+
+ if (dlen >= len)
+ strbuf_grow(sb, dlen - len);
+ memmove(sb->buf + pos + dlen,
+ sb->buf + pos + len,
+ sb->len - pos - len);
+ memcpy(sb->buf + pos, data, dlen);
+ strbuf_setlen(sb, sb->len + dlen - len);
+}
+
+void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len)
+{
+ strbuf_splice(sb, pos, 0, data, len);
+}
+
+void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
+{
+ strbuf_splice(sb, pos, len, NULL, 0);
+}
+
+void strbuf_add(struct strbuf *sb, const void *data, size_t len)
+{
strbuf_grow(sb, len);
memcpy(sb->buf + sb->len, data, len);
strbuf_setlen(sb, sb->len + len);
}
-void strbuf_addf(struct strbuf *sb, const char *fmt, ...) {
+void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
+{
int len;
va_list ap;
if (len < 0) {
len = 0;
}
- if (len >= strbuf_avail(sb)) {
+ if (len > strbuf_avail(sb)) {
strbuf_grow(sb, len);
va_start(ap, fmt);
len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
va_end(ap);
- if (len >= strbuf_avail(sb)) {
+ if (len > strbuf_avail(sb)) {
die("this should not happen, your snprintf is broken");
}
}
strbuf_setlen(sb, sb->len + len);
}
-size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f) {
+size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f)
+{
size_t res;
strbuf_grow(sb, size);
return res;
}
-ssize_t strbuf_read(struct strbuf *sb, int fd)
+ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
{
size_t oldlen = sb->len;
+ strbuf_grow(sb, hint ? hint : 8192);
for (;;) {
ssize_t cnt;
- strbuf_grow(sb, 8192);
cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
if (cnt < 0) {
strbuf_setlen(sb, oldlen);
if (!cnt)
break;
sb->len += cnt;
+ strbuf_grow(sb, 8192);
}
sb->buf[sb->len] = '\0';
return sb->len - oldlen;
}
-void read_line(struct strbuf *sb, FILE *fp, int term) {
+int strbuf_getline(struct strbuf *sb, FILE *fp, int term)
+{
int ch;
- if (feof(fp)) {
- strbuf_release(sb);
- sb->eof = 1;
- return;
- }
+
+ strbuf_grow(sb, 0);
+ if (feof(fp))
+ return EOF;
strbuf_reset(sb);
while ((ch = fgetc(fp)) != EOF) {
strbuf_grow(sb, 1);
sb->buf[sb->len++] = ch;
}
- if (ch == EOF && sb->len == 0) {
- strbuf_release(sb);
- sb->eof = 1;
- }
+ if (ch == EOF && sb->len == 0)
+ return EOF;
- strbuf_grow(sb, 1);
sb->buf[sb->len] = '\0';
+ return 0;
+}
+
+int strbuf_read_file(struct strbuf *sb, const char *path, size_t hint)
+{
+ int fd, len;
+
+ fd = open(path, O_RDONLY);
+ if (fd < 0)
+ return -1;
+ len = strbuf_read(sb, fd, hint);
+ close(fd);
+ if (len < 0)
+ return -1;
+
+ return len;
}