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#include <sys/types.h>
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include <stdarg.h>
#include <stdio.h>
struct chunk {
struct chunk *next;
size_t length;
char text[];
};
struct strbuf {
size_t length;
struct chunk *head, *tail;
};
struct strbuf *strbuf_new(void) {
struct strbuf *sb = malloc(sizeof(struct strbuf));
assert(sb);
sb->length = 0;
sb->head = sb->tail = NULL;
return sb;
}
void strbuf_free(struct strbuf *sb) {
assert(sb);
while (sb->head) {
struct chunk *c = sb->head;
sb->head = sb->head->next;
free(c);
}
free(sb);
}
char *strbuf_tostring(struct strbuf *sb) {
char *t, *e;
struct chunk *c;
assert(sb);
t = malloc(sb->length+1);
assert(t);
e = t;
for (c = sb->head; c; c = c->next) {
memcpy(e, c->text, c->length);
e += c->length;
}
*e = 0;
return t;
}
char *strbuf_tostring_free(struct strbuf *sb) {
char *t;
assert(sb);
t = strbuf_tostring(sb);
strbuf_free(sb);
return t;
}
void strbuf_puts(struct strbuf *sb, const char *t) {
struct chunk *c;
size_t l;
assert(sb && t);
l = strlen(t);
c = malloc(sizeof(struct chunk)+l);
assert(c);
c->next = NULL;
c->length = l;
memcpy(c->text, t, l);
if (sb->tail) {
assert(sb->head);
sb->tail->next = c;
} else {
assert(!sb->head);
sb->head = c;
}
sb->tail = c;
sb->length += l;
}
int strbuf_printf(struct strbuf *sb, const char *format, ...) {
int r, size = 100;
struct chunk *c = NULL;
assert(sb);
for(;;) {
va_list ap;
c = realloc(c, sizeof(struct chunk)+size);
assert(c);
va_start(ap, format);
r = vsnprintf(c->text, size, format, ap);
va_end(ap);
if (r > -1 && r < size) {
c->length = r;
c->next = NULL;
if (sb->tail) {
assert(sb->head);
sb->tail->next = c;
} else {
assert(!sb->head);
sb->head = c;
}
sb->tail = c;
sb->length += r;
return r;
}
if (r > -1) /* glibc 2.1 */
size = r+1;
else /* glibc 2.0 */
size *= 2;
}
}
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