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bsstr.c
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bsstr.c
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/* String utility
*
* Copyright (C) 2014 Borislav Sapundzhiev
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or (at
* your option) any later version.
*
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#include "bsstr.h"
struct bsstr {
char *string;
size_t length;
size_t capacity;
};
#define STRING_BLOCK_SIZE 32
static bsstr * bsstr_realloc(bsstr *buf, size_t len);
static bsstr * bsstr_init(bsstr* str);
bsstr *bsstr_create(const char *data)
{
bsstr *str = (bsstr *)malloc(sizeof (bsstr));
if (!str) return NULL;
bsstr_init(str);
if (data) {
bsstr_add(str, data);
}
return str;
}
bsstr *bsstr_init(bsstr* str)
{
str->string = NULL;
str->length = 0;
str->capacity = STRING_BLOCK_SIZE;
str->string = malloc(str->capacity);
return str;
}
bsstr * bsstr_realloc(bsstr *buf, size_t len)
{
static const size_t mask = ~(STRING_BLOCK_SIZE - 1);
size_t newlen = buf->length + len + 1; /* add 1 for NUL */
if (newlen > buf->capacity) {
void *new_mem;
buf->capacity = (newlen + (STRING_BLOCK_SIZE - 1)) & mask;
//buf->string = (char *)realloc(buf->string, buf->capacity);
new_mem = malloc(buf->capacity);
if (!new_mem) return NULL;
memmove(new_mem, buf->string, buf->length);
free(buf->string);
buf->string = new_mem;
}
return buf;
}
void bsstr_add(bsstr* str, const char* string)
{
size_t len = strlen(string);
if (bsstr_realloc(str, len)) {
strcpy(str->string + str->length, string);
str->length += len;
str->string[str->length] = '\0';
}
}
/*based on snprintf man */
void bsstr_printf(bsstr* buf, char* fmt, ...)
{
int size = STRING_BLOCK_SIZE;
va_list ap;
int end = buf->length;
bsstr *p = bsstr_realloc(buf, size);
if (p == NULL) {
return;
}
while (1) {
int n;
va_start(ap, fmt);
n = vsnprintf(buf->string + end, size, fmt, ap);
va_end(ap);
if (n > -1 && n < size) {
buf->length = end + n;
return;
}
if (n > -1)
size = n + 1;
else
size *= 2;
if((p = bsstr_realloc(buf, size)) == NULL ) {
return;
}
}
}
void bsstr_addchr(bsstr* str, char ch)
{
char s[] = {ch,'\0'};
bsstr_add(str, s);
}
void bsstr_delete(bsstr *str)
{
free(str->string);
free(str);
}
char *bsstr_release(bsstr* str)
{
char *result = str->string;
free(str);
return result;
}
char *bsstr_get_bufref(bsstr* str)
{
return str->string;
}
int bsstr_length(bsstr *str)
{
return str->length;
}
void bsstr_clear(bsstr* str)
{
str->length = 0;
str->string[0] = '\0';
}
char *bsstr_get_buf(bsstr* str)
{
char *result = str->string;
bsstr_init(str);
return result;
}