strbuf API additions and enhancements.

[thirdparty/git.git] / strbuf.c

diff --git a/strbuf.c b/strbuf.c
index e33d06b87c978ad7484c9d6bf972681c3d6cdeb0..dcb725dcdd2f8edb04502fed425bd3b7a7204ebf 100644 (file)
--- a/strbuf.c
+++ b/strbuf.c
@@ -1,41 +1,167 @@
 #include "cache.h"
-#include "strbuf.h"
 
-void strbuf_init(struct strbuf *sb) {
-       sb->buf = NULL;
-       sb->eof = sb->alloc = sb->len = 0;
+void strbuf_init(struct strbuf *sb, size_t hint)
+{
+       memset(sb, 0, sizeof(*sb));
+       if (hint)
+               strbuf_grow(sb, hint);
 }
 
-static void strbuf_begin(struct strbuf *sb) {
+void strbuf_release(struct strbuf *sb)
+{
        free(sb->buf);
-       strbuf_init(sb);
+       memset(sb, 0, sizeof(*sb));
 }
 
-static void inline strbuf_add(struct strbuf *sb, int ch) {
-       if (sb->alloc <= sb->len) {
-               sb->alloc = sb->alloc * 3 / 2 + 16;
-               sb->buf = xrealloc(sb->buf, sb->alloc);
+void strbuf_reset(struct strbuf *sb)
+{
+       if (sb->len)
+               strbuf_setlen(sb, 0);
+}
+
+char *strbuf_detach(struct strbuf *sb)
+{
+       char *res = sb->buf;
+       strbuf_init(sb, 0);
+       return res;
+}
+
+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");
+       ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
+}
+
+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';
+}
+
+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, ...)
+{
+       int len;
+       va_list ap;
+
+       va_start(ap, fmt);
+       len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
+       va_end(ap);
+       if (len < 0) {
+               len = 0;
        }
-       sb->buf[sb->len++] = ch;
+       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)) {
+                       die("this should not happen, your snprintf is broken");
+               }
+       }
+       strbuf_setlen(sb, sb->len + len);
 }
 
-static void strbuf_end(struct strbuf *sb) {
-       strbuf_add(sb, 0);
+size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f)
+{
+       size_t res;
+
+       strbuf_grow(sb, size);
+       res = fread(sb->buf + sb->len, 1, size, f);
+       if (res > 0) {
+               strbuf_setlen(sb, sb->len + res);
+       }
+       return res;
 }
 
-void read_line(struct strbuf *sb, FILE *fp, int term) {
-       int ch;
-       strbuf_begin(sb);
-       if (feof(fp)) {
-               sb->eof = 1;
-               return;
+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;
+
+               cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
+               if (cnt < 0) {
+                       strbuf_setlen(sb, oldlen);
+                       return -1;
+               }
+               if (!cnt)
+                       break;
+               sb->len += cnt;
+               strbuf_grow(sb, 8192);
        }
+
+       sb->buf[sb->len] = '\0';
+       return sb->len - oldlen;
+}
+
+int strbuf_getline(struct strbuf *sb, FILE *fp, int term)
+{
+       int ch;
+
+       strbuf_grow(sb, 0);
+       if (feof(fp))
+               return EOF;
+
+       strbuf_reset(sb);
        while ((ch = fgetc(fp)) != EOF) {
                if (ch == term)
                        break;
-               strbuf_add(sb, ch);
+               strbuf_grow(sb, 1);
+               sb->buf[sb->len++] = ch;
        }
        if (ch == EOF && sb->len == 0)
-               sb->eof = 1;
-       strbuf_end(sb);
+               return EOF;
+
+       sb->buf[sb->len] = '\0';
+       return 0;
 }