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#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include <stdarg.h>
#include <stdio.h>
#include "buffer.h"
#include "util.h"
static void buf_realloc(struct buffer *buf, size_t new_size) {
if (new_size > buf->size) {
buf->size = new_size + 1;
buf->data = realloc(buf->data, buf->size);
}
}
struct buffer *buf_new(const char *init) {
struct buffer *buf = malloc(sizeof(struct buffer));
if (init) {
buf->data = strdup(init);
buf->len = strlen(init);
buf->size = buf->len + 1;
} else {
buf->size = 1024;
buf->data = malloc(buf->size);
*buf->data = '\0';
buf->len = 0;
}
return buf;
}
void buf_del(struct buffer **buf) {
assert(*buf);
struct buffer *tmp = *buf;
free(tmp->data);
free(tmp);
*buf = NULL;
}
struct buffer *buf_dup(struct buffer *src) {
struct buffer *dest = malloc(sizeof(struct buffer));
dest->len = src->len;
dest->size = src->size;
dest->data = malloc(dest->size);
memcpy(dest->data, src->data, dest->size);
return dest;
}
char *buf_strdup(struct buffer *buf) {
return strdup(buf->data);
}
void buf_append(struct buffer *buf, const char *str) {
size_t len = strlen(str);
buf_realloc(buf, buf->len + len + 1);
strncat(buf->data, str, buf->size);
}
void buf_printf(struct buffer *buf, char *fmt, ...) {
va_list ap;
ssize_t len;
va_start(ap, fmt);
len = vsnprintf(buf->data, buf->size, fmt, ap);
va_end(ap);
if (len >= buf->size) {
buf_realloc(buf, len + 1);
va_start(ap, fmt);
len = vsnprintf(buf->data, buf->size, fmt, ap);
va_end(ap);
}
if (len < 0 || len >= buf->size) {
fprintf(stderr, "buf_printf: failed to format str");
exit(EXIT_FAILURE);
}
buf->len = len;
}
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