Make the 'lock file' exists error more informative

diff --git a/strbuf.c b/strbuf.c
index 4aed75265e945d7b8dfafb36913006376768b4d3..6ed06840b856a91f6d215c9a862e064f521384f0 100644 (file)
--- a/strbuf.c
+++ b/strbuf.c
@@ -60,6 +60,18 @@ void strbuf_grow(struct strbuf *sb, size_t extra)
        ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
 }
 
+void strbuf_trim(struct strbuf *sb)
+{
+       char *b = sb->buf;
+       while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
+               sb->len--;
+       while (sb->len > 0 && isspace(*b)) {
+               b++;
+               sb->len--;
+       }
+       memmove(sb->buf, b, sb->len);
+       sb->buf[sb->len] = '\0';
+}
 void strbuf_rtrim(struct strbuf *sb)
 {
        while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
@@ -67,7 +79,65 @@ void strbuf_rtrim(struct strbuf *sb)
        sb->buf[sb->len] = '\0';
 }
 
-int strbuf_cmp(struct strbuf *a, struct strbuf *b)
+void strbuf_ltrim(struct strbuf *sb)
+{
+       char *b = sb->buf;
+       while (sb->len > 0 && isspace(*b)) {
+               b++;
+               sb->len--;
+       }
+       memmove(sb->buf, b, sb->len);
+       sb->buf[sb->len] = '\0';
+}
+
+void strbuf_tolower(struct strbuf *sb)
+{
+       int i;
+       for (i = 0; i < sb->len; i++)
+               sb->buf[i] = tolower(sb->buf[i]);
+}
+
+struct strbuf **strbuf_split(const struct strbuf *sb, int delim)
+{
+       int alloc = 2, pos = 0;
+       char *n, *p;
+       struct strbuf **ret;
+       struct strbuf *t;
+
+       ret = xcalloc(alloc, sizeof(struct strbuf *));
+       p = n = sb->buf;
+       while (n < sb->buf + sb->len) {
+               int len;
+               n = memchr(n, delim, sb->len - (n - sb->buf));
+               if (pos + 1 >= alloc) {
+                       alloc = alloc * 2;
+                       ret = xrealloc(ret, sizeof(struct strbuf *) * alloc);
+               }
+               if (!n)
+                       n = sb->buf + sb->len - 1;
+               len = n - p + 1;
+               t = xmalloc(sizeof(struct strbuf));
+               strbuf_init(t, len);
+               strbuf_add(t, p, len);
+               ret[pos] = t;
+               ret[++pos] = NULL;
+               p = ++n;
+       }
+       return ret;
+}
+
+void strbuf_list_free(struct strbuf **sbs)
+{
+       struct strbuf **s = sbs;
+
+       while (*s) {
+               strbuf_release(*s);
+               free(*s++);
+       }
+       free(sbs);
+}
+
+int strbuf_cmp(const struct strbuf *a, const struct strbuf *b)
 {
        int cmp;
        if (a->len < b->len) {
@@ -167,21 +237,40 @@ void strbuf_expand(struct strbuf *sb, const char *format, expand_fn_t fn,
        }
 }
 
+size_t strbuf_expand_dict_cb(struct strbuf *sb, const char *placeholder,
+               void *context)
+{
+       struct strbuf_expand_dict_entry *e = context;
+       size_t len;
+
+       for (; e->placeholder && (len = strlen(e->placeholder)); e++) {
+               if (!strncmp(placeholder, e->placeholder, len)) {
+                       if (e->value)
+                               strbuf_addstr(sb, e->value);
+                       return len;
+               }
+       }
+       return 0;
+}
+
 size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f)
 {
        size_t res;
+       size_t oldalloc = sb->alloc;
 
        strbuf_grow(sb, size);
        res = fread(sb->buf + sb->len, 1, size, f);
-       if (res > 0) {
+       if (res > 0)
                strbuf_setlen(sb, sb->len + res);
-       }
+       else if (res < 0 && oldalloc == 0)
+               strbuf_release(sb);
        return res;
 }
 
 ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
 {
        size_t oldlen = sb->len;
+       size_t oldalloc = sb->alloc;
 
        strbuf_grow(sb, hint ? hint : 8192);
        for (;;) {
@@ -189,7 +278,10 @@ ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
 
                cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
                if (cnt < 0) {
-                       strbuf_setlen(sb, oldlen);
+                       if (oldalloc == 0)
+                               strbuf_release(sb);
+                       else
+                               strbuf_setlen(sb, oldlen);
                        return -1;
                }
                if (!cnt)
@@ -202,6 +294,36 @@ ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
        return sb->len - oldlen;
 }
 
+#define STRBUF_MAXLINK (2*PATH_MAX)
+
+int strbuf_readlink(struct strbuf *sb, const char *path, size_t hint)
+{
+       size_t oldalloc = sb->alloc;
+
+       if (hint < 32)
+               hint = 32;
+
+       while (hint < STRBUF_MAXLINK) {
+               int len;
+
+               strbuf_grow(sb, hint);
+               len = readlink(path, sb->buf, hint);
+               if (len < 0) {
+                       if (errno != ERANGE)
+                               break;
+               } else if (len < hint) {
+                       strbuf_setlen(sb, len);
+                       return 0;
+               }
+
+               /* .. the buffer was too small - try again */
+               hint *= 2;
+       }
+       if (oldalloc == 0)
+               strbuf_release(sb);
+       return -1;
+}
+
 int strbuf_getline(struct strbuf *sb, FILE *fp, int term)
 {
        int ch;