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#include <assert.h>
#include <limits.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "cmark_ctype.h"
#include "buffer.h"
/* Used as default value for cmark_strbuf->ptr so that people can always
* assume ptr is non-NULL and zero terminated even for new cmark_strbufs.
*/
unsigned char cmark_strbuf__initbuf[1];
#ifndef MIN
#define MIN(x, y) ((x < y) ? x : y)
#endif
void cmark_strbuf_init(cmark_mem *mem, cmark_strbuf *buf,
bufsize_t initial_size) {
buf->mem = mem;
buf->asize = 0;
buf->size = 0;
buf->ptr = cmark_strbuf__initbuf;
if (initial_size > 0)
cmark_strbuf_grow(buf, initial_size);
}
static inline void S_strbuf_grow_by(cmark_strbuf *buf, bufsize_t add) {
cmark_strbuf_grow(buf, buf->size + add);
}
void cmark_strbuf_grow(cmark_strbuf *buf, bufsize_t target_size) {
assert(target_size > 0);
if (target_size < buf->asize)
return;
if (target_size > (bufsize_t)(INT32_MAX / 2)) {
fprintf(stderr,
"[cmark] cmark_strbuf_grow requests buffer with size > %d, aborting\n",
(INT32_MAX / 2));
abort();
}
/* Oversize the buffer by 50% to guarantee amortized linear time
* complexity on append operations. */
bufsize_t new_size = target_size + target_size / 2;
new_size += 1;
new_size = (new_size + 7) & ~7;
buf->ptr = (unsigned char *)buf->mem->realloc(buf->asize ? buf->ptr : NULL,
new_size);
buf->asize = new_size;
}
void cmark_strbuf_free(cmark_strbuf *buf) {
if (!buf)
return;
if (buf->ptr != cmark_strbuf__initbuf)
buf->mem->free(buf->ptr);
cmark_strbuf_init(buf->mem, buf, 0);
}
void cmark_strbuf_clear(cmark_strbuf *buf) {
buf->size = 0;
if (buf->asize > 0)
buf->ptr[0] = '\0';
}
void cmark_strbuf_set(cmark_strbuf *buf, const unsigned char *data,
bufsize_t len) {
if (len <= 0 || data == NULL) {
cmark_strbuf_clear(buf);
} else {
if (data != buf->ptr) {
if (len >= buf->asize)
cmark_strbuf_grow(buf, len);
memmove(buf->ptr, data, len);
}
buf->size = len;
buf->ptr[buf->size] = '\0';
}
}
void cmark_strbuf_putc(cmark_strbuf *buf, int c) {
S_strbuf_grow_by(buf, 1);
buf->ptr[buf->size++] = (unsigned char)(c & 0xFF);
buf->ptr[buf->size] = '\0';
}
void cmark_strbuf_put(cmark_strbuf *buf, const unsigned char *data,
bufsize_t len) {
if (len <= 0)
return;
S_strbuf_grow_by(buf, len);
memmove(buf->ptr + buf->size, data, len);
buf->size += len;
buf->ptr[buf->size] = '\0';
}
void cmark_strbuf_puts(cmark_strbuf *buf, const char *string) {
cmark_strbuf_put(buf, (const unsigned char *)string, (bufsize_t)strlen(string));
}
unsigned char *cmark_strbuf_detach(cmark_strbuf *buf) {
unsigned char *data = buf->ptr;
if (buf->asize == 0) {
/* return an empty string */
return (unsigned char *)buf->mem->calloc(1, 1);
}
cmark_strbuf_init(buf->mem, buf, 0);
return data;
}
void cmark_strbuf_truncate(cmark_strbuf *buf, bufsize_t len) {
if (len < 0)
len = 0;
if (len < buf->size) {
buf->size = len;
buf->ptr[buf->size] = '\0';
}
}
void cmark_strbuf_drop(cmark_strbuf *buf, bufsize_t n) {
if (n > 0) {
if (n > buf->size)
n = buf->size;
buf->size = buf->size - n;
if (buf->size)
memmove(buf->ptr, buf->ptr + n, buf->size);
buf->ptr[buf->size] = '\0';
}
}
void cmark_strbuf_rtrim(cmark_strbuf *buf) {
if (!buf->size)
return;
while (buf->size > 0) {
if (!cmark_isspace(buf->ptr[buf->size - 1]))
break;
buf->size--;
}
buf->ptr[buf->size] = '\0';
}
void cmark_strbuf_trim(cmark_strbuf *buf) {
bufsize_t i = 0;
if (!buf->size)
return;
while (i < buf->size && cmark_isspace(buf->ptr[i]))
i++;
cmark_strbuf_drop(buf, i);
cmark_strbuf_rtrim(buf);
}
// Destructively modify string, collapsing consecutive
// space and newline characters into a single space.
void cmark_strbuf_normalize_whitespace(cmark_strbuf *s) {
bool last_char_was_space = false;
bufsize_t r, w;
for (r = 0, w = 0; r < s->size; ++r) {
if (cmark_isspace(s->ptr[r])) {
if (!last_char_was_space) {
s->ptr[w++] = ' ';
last_char_was_space = true;
}
} else {
s->ptr[w++] = s->ptr[r];
last_char_was_space = false;
}
}
cmark_strbuf_truncate(s, w);
}
// Destructively unescape a string: remove backslashes before punctuation chars.
void cmark_strbuf_unescape(cmark_strbuf *buf) {
bufsize_t r, w;
for (r = 0, w = 0; r < buf->size; ++r) {
if (buf->ptr[r] == '\\' && cmark_ispunct(buf->ptr[r + 1]))
r++;
buf->ptr[w++] = buf->ptr[r];
}
cmark_strbuf_truncate(buf, w);
}
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