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/*
* Crossfire -- cooperative multi-player graphical RPG and adventure game
*
* Copyright (c) 1999-2014 Mark Wedel and the Crossfire Development Team
* Copyright (c) 1992 Frank Tore Johansen
*
* Crossfire is free software and comes with ABSOLUTELY NO WARRANTY. You are
* welcome to redistribute it under certain conditions. For details, please
* see COPYING and LICENSE.
*
* The authors can be reached via e-mail at <crossfire@metalforge.org>.
*/
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include "global.h"
#include "libproto.h"
#include "stringbuffer.h"
/**
* A buffer that will be expanded as content is added to it.
*/
struct StringBuffer {
/**
* The string buffer. The first {@link #pos} bytes contain the collected
* string. Its size is at least {@link #size} bytes.
*/
char *buf;
/**
* The current length of {@link #buf}. The invariant <code>pos <
* size</code> always holds; this means there is always enough room to
* attach a trailing \0 character.
*/
size_t pos;
/**
* The allocation size of {@link #buf}.
*/
size_t size;
};
/**
* Make sure that at least <code>len</code> bytes are available in the passed
* string buffer.
*
* @param sb The string buffer to modify.
*
* @param len The number of bytes to allocate.
*/
static void stringbuffer_ensure(StringBuffer *sb, size_t len);
StringBuffer *stringbuffer_new(void) {
StringBuffer *sb;
sb = malloc(sizeof(*sb));
if (sb == NULL) {
fatal(OUT_OF_MEMORY);
}
sb->size = 512;
sb->buf = malloc(sb->size);
sb->pos = 0;
return sb;
}
void stringbuffer_delete(StringBuffer *sb) {
free(sb->buf);
free(sb);
}
char *stringbuffer_finish(StringBuffer *sb) {
char *result;
sb->buf[sb->pos] = '\0';
result = sb->buf;
free(sb);
return result;
}
sstring stringbuffer_finish_shared(StringBuffer *sb) {
char *str;
sstring result;
str = stringbuffer_finish(sb);
result = add_string(str);
free(str);
return result;
}
void stringbuffer_append_string(StringBuffer *sb, const char *str) {
size_t len;
len = strlen(str);
stringbuffer_ensure(sb, len+1);
memcpy(sb->buf+sb->pos, str, len);
sb->pos += len;
}
void stringbuffer_append_printf(StringBuffer *sb, const char *format, ...) {
size_t size;
size = 100; /* arbitrary guess */
for (;;) {
int n;
va_list arg;
stringbuffer_ensure(sb, size);
va_start(arg, format);
n = vsnprintf(sb->buf+sb->pos, size, format, arg);
va_end(arg);
if (n > -1 && (size_t)n < size) {
sb->pos += (size_t)n;
break;
}
if (n > -1) {
size = n+1; /* precisely what is needed */
} else {
size *= 2; /* twice the old size */
}
}
}
void stringbuffer_append_stringbuffer(StringBuffer *sb, const StringBuffer *sb2) {
stringbuffer_ensure(sb, sb2->pos+1);
memcpy(sb->buf+sb->pos, sb2->buf, sb2->pos);
sb->pos += sb2->pos;
}
/**
* Ensure sb can hold at least len more characters, growing the sb if not.
*/
static void stringbuffer_ensure(StringBuffer *sb, size_t len) {
char *tmp;
const size_t newlen = sb->pos+len;
if (newlen <= sb->size) {
return;
}
#if 0
putchar('.');
fflush(stdout);
#endif
do {
sb->size *= 1.5;
} while (newlen > sb->size);
tmp = realloc(sb->buf, sb->size);
if (tmp == NULL) {
fatal(OUT_OF_MEMORY);
}
sb->buf = tmp;
}
size_t stringbuffer_length(StringBuffer *sb) {
return sb->pos;
}
void stringbuffer_trim_whitespace(StringBuffer *sb) {
while (sb->pos > 0 && isspace(sb->buf[sb->pos-1])) {
sb->pos--;
}
}
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