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