2 #include <linux/kernel.h>
4 int prefixcmp(const char *str, const char *prefix)
6 for (; ; str++, prefix++)
9 else if (*str != *prefix)
10 return (unsigned char)*prefix - (unsigned char)*str;
14 * Used as the default ->buf value, so that people can always assume
15 * buf is non NULL and ->buf is NUL terminated even for a freshly
18 char strbuf_slopbuf[1];
20 void strbuf_init(struct strbuf *sb, ssize_t hint)
22 sb->alloc = sb->len = 0;
23 sb->buf = strbuf_slopbuf;
25 strbuf_grow(sb, hint);
28 void strbuf_release(struct strbuf *sb)
36 char *strbuf_detach(struct strbuf *sb, size_t *sz)
38 char *res = sb->alloc ? sb->buf : NULL;
45 void strbuf_grow(struct strbuf *sb, size_t extra)
47 if (sb->len + extra + 1 <= sb->len)
48 die("you want to use way too much memory");
51 ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
54 void strbuf_addch(struct strbuf *sb, int c)
57 sb->buf[sb->len++] = c;
58 sb->buf[sb->len] = '\0';
61 void strbuf_add(struct strbuf *sb, const void *data, size_t len)
64 memcpy(sb->buf + sb->len, data, len);
65 strbuf_setlen(sb, sb->len + len);
68 static void strbuf_addv(struct strbuf *sb, const char *fmt, va_list ap)
73 if (!strbuf_avail(sb))
76 va_copy(ap_saved, ap);
77 len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
79 die("your vsnprintf is broken");
80 if (len > strbuf_avail(sb)) {
82 len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap_saved);
84 if (len > strbuf_avail(sb)) {
85 die("this should not happen, your vsnprintf is broken");
88 strbuf_setlen(sb, sb->len + len);
91 void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
96 strbuf_addv(sb, fmt, ap);
100 ssize_t strbuf_read(struct strbuf *sb, int fd, ssize_t hint)
102 size_t oldlen = sb->len;
103 size_t oldalloc = sb->alloc;
105 strbuf_grow(sb, hint ? hint : 8192);
109 cnt = read(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
114 strbuf_setlen(sb, oldlen);
120 strbuf_grow(sb, 8192);
123 sb->buf[sb->len] = '\0';
124 return sb->len - oldlen;