88 lines
1.7 KiB
C
88 lines
1.7 KiB
C
|
#include "strbuf.h"
|
||
|
|
|
||
|
|
#include <assert.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <string.h>
|
||
|
|
|
||
|
|
#include <stdio.h>
|
||
|
|
|
||
|
|
bool
|
||
|
|
sc_strbuf_init(struct sc_strbuf *buf, size_t init_cap) {
|
||
|
|
buf->s = malloc(init_cap + 1); // +1 for '\0'
|
||
|
|
if (!buf->s) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
buf->len = 0;
|
||
|
|
buf->cap = init_cap;
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
static bool
|
||
|
|
sc_strbuf_reserve(struct sc_strbuf *buf, size_t len) {
|
||
|
|
if (buf->len + len > buf->cap) {
|
||
|
|
size_t new_cap = buf->cap * 3 / 2 + len;
|
||
|
|
char *s = realloc(buf->s, new_cap + 1); // +1 for '\0'
|
||
|
|
if (!s) {
|
||
|
|
// Leave the old buf->s
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
buf->s = s;
|
||
|
|
buf->cap = new_cap;
|
||
|
|
}
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
bool
|
||
|
|
sc_strbuf_append(struct sc_strbuf *buf, const char *s, size_t len) {
|
||
|
|
assert(s);
|
||
|
|
assert(*s);
|
||
|
|
assert(strlen(s) >= len);
|
||
|
|
if (!sc_strbuf_reserve(buf, len)) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
memcpy(&buf->s[buf->len], s, len);
|
||
|
|
buf->len += len;
|
||
|
|
buf->s[buf->len] = '\0';
|
||
|
|
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
bool
|
||
|
|
sc_strbuf_append_char(struct sc_strbuf *buf, const char c) {
|
||
|
|
if (!sc_strbuf_reserve(buf, 1)) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
buf->s[buf->len] = c;
|
||
|
|
buf->len ++;
|
||
|
|
buf->s[buf->len] = '\0';
|
||
|
|
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
bool
|
||
|
|
sc_strbuf_append_n(struct sc_strbuf *buf, const char c, size_t n) {
|
||
|
|
if (!sc_strbuf_reserve(buf, n)) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
memset(&buf->s[buf->len], c, n);
|
||
|
|
buf->len += n;
|
||
|
|
buf->s[buf->len] = '\0';
|
||
|
|
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
sc_strbuf_shrink(struct sc_strbuf *buf) {
|
||
|
|
assert(buf->len <= buf->cap);
|
||
|
|
if (buf->len != buf->cap) {
|
||
|
|
char *s = realloc(buf->s, buf->len + 1); // +1 for '\0'
|
||
|
|
assert(s); // decreasing the size may not fail
|
||
|
|
buf->s = s;
|
||
|
|
buf->cap = buf->len;
|
||
|
|
}
|
||
|
|
}
|