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#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <stdio.h>
#include "buffer.h"
#include "util.h"
#ifndef BUFFER_SIZE
#define BUFFER_SIZE 1024
#endif
void buffer_init(Buffer *buf) {
memset(buf, 0, sizeof *buf);
}
bool buffer_reserve(Buffer *buf, size_t size) {
/* ensure minimal buffer size, to avoid repeated realloc(3) calls */
if (size < BUFFER_SIZE)
size = BUFFER_SIZE;
if (buf->size < size) {
size = MAX(size, buf->size*2);
char *data = realloc(buf->data, size);
if (!data)
return false;
buf->size = size;
buf->data = data;
}
return true;
}
bool buffer_grow(Buffer *buf, size_t len) {
size_t size;
if (!addu(buf->len, len, &size))
return false;
return buffer_reserve(buf, size);
}
bool buffer_terminate(Buffer *buf) {
return !buf->data || buf->len == 0 || buf->data[buf->len-1] == '\0' ||
buffer_append(buf, "\0", 1);
}
void buffer_release(Buffer *buf) {
if (!buf)
return;
free(buf->data);
buffer_init(buf);
}
void buffer_clear(Buffer *buf) {
buf->len = 0;
}
bool buffer_put(Buffer *buf, const void *data, size_t len) {
if (!buffer_reserve(buf, len))
return false;
memmove(buf->data, data, len);
buf->len = len;
return true;
}
bool buffer_put0(Buffer *buf, const char *data) {
return buffer_put(buf, data, strlen(data)+1);
}
bool buffer_remove(Buffer *buf, size_t pos, size_t len) {
size_t end;
if (len == 0)
return true;
if (!addu(pos, len, &end) || end > buf->len)
return false;
memmove(buf->data + pos, buf->data + pos + len, buf->len - pos - len);
buf->len -= len;
return true;
}
bool buffer_insert(Buffer *buf, size_t pos, const void *data, size_t len) {
if (pos > buf->len)
return false;
if (len == 0)
return true;
if (!buffer_grow(buf, len))
return false;
size_t move = buf->len - pos;
if (move > 0)
memmove(buf->data + pos + len, buf->data + pos, move);
memcpy(buf->data + pos, data, len);
buf->len += len;
return true;
}
bool buffer_insert0(Buffer *buf, size_t pos, const char *data) {
if (pos == 0)
return buffer_prepend0(buf, data);
if (pos == buf->len)
return buffer_append0(buf, data);
return buffer_insert(buf, pos, data, strlen(data));
}
bool buffer_append(Buffer *buf, const void *data, size_t len) {
return buffer_insert(buf, buf->len, data, len);
}
bool buffer_append0(Buffer *buf, const char *data) {
size_t nul = (buf->len > 0 && buf->data[buf->len-1] == '\0') ? 1 : 0;
buf->len -= nul;
bool ret = buffer_append(buf, data, strlen(data)+1);
if (!ret)
buf->len += nul;
return ret;
}
bool buffer_prepend(Buffer *buf, const void *data, size_t len) {
return buffer_insert(buf, 0, data, len);
}
bool buffer_prepend0(Buffer *buf, const char *data) {
return buffer_prepend(buf, data, strlen(data) + (buf->len == 0));
}
static bool buffer_vappendf(Buffer *buf, const char *fmt, va_list ap) {
va_list ap_save;
va_copy(ap_save, ap);
int len = vsnprintf(NULL, 0, fmt, ap);
if (len == -1 || !buffer_grow(buf, len+1)) {
va_end(ap_save);
return false;
}
size_t nul = (buf->len > 0 && buf->data[buf->len-1] == '\0') ? 1 : 0;
buf->len -= nul;
bool ret = vsnprintf(buf->data+buf->len, len+1, fmt, ap_save) == len;
buf->len += ret ? (size_t)len+1 : nul;
va_end(ap_save);
return ret;
}
bool buffer_appendf(Buffer *buf, const char *fmt, ...) {
va_list ap;
va_start(ap, fmt);
bool ret = buffer_vappendf(buf, fmt, ap);
va_end(ap);
return ret;
}
bool buffer_printf(Buffer *buf, const char *fmt, ...) {
buffer_clear(buf);
va_list ap;
va_start(ap, fmt);
bool ret = buffer_vappendf(buf, fmt, ap);
va_end(ap);
return ret;
}
size_t buffer_length0(Buffer *buf) {
size_t len = buf->len;
if (len > 0 && buf->data[len-1] == '\0')
len--;
return len;
}
size_t buffer_length(Buffer *buf) {
return buf->len;
}
size_t buffer_capacity(Buffer *buf) {
return buf->size;
}
const char *buffer_content(Buffer *buf) {
return buf->data;
}
const char *buffer_content0(Buffer *buf) {
if (buf->len == 0 || !buffer_terminate(buf))
return "";
return buf->data;
}
char *buffer_move(Buffer *buf) {
char *data = buf->data;
buffer_init(buf);
return data;
}
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