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aandvalenzuela
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RRTcodebaseC

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buf = malloc(char_cnt_without_zero+2 /* +1 would be enough, however, protect against off-by-one-errors */);
if (buf==NULL) {
va_end(argp_copy);
dc_strbuilder_cat(strbuilder, "ErrMem");
return;
}
vsnprintf(buf, char_cnt_without_zero+1, format, argp_copy);
va_end(argp_copy);
dc_strbuilder_cat(strbuilder, buf);
free(buf);
}
/**
* Set the string to a lenght of 0. This does not free the buffer;
* if you want to free the buffer, you have to call free() on dc_strbuilder_t::buf.
*
* @param strbuilder The object to initialze. Must be initialized with
* dc_strbuilder_init().
* @return None.
*/
void dc_strbuilder_empty(dc_strbuilder_t* strbuilder)
{
strbuilder->buf[0] = 0;
strbuilder->free = strbuilder->allocated - 1 /*the nullbyte! */;
strbuilder->eos = strbuilder->buf;
}
```
Filename: dc_strencode.c
```c
#include <ctype.h>
#include <libetpan/libetpan.h>
#include "dc_context.h"
#include "dc_strencode.h"
/*******************************************************************************
* URL encoding and decoding, RFC 3986
******************************************************************************/
static char int_2_uppercase_hex(char code)
{
static const char hex[] = "0123456789ABCDEF";
return hex[code & 15];
}
static char hex_2_int(char ch)
{
return isdigit(ch) ? ch - '0' : tolower(ch) - 'a' + 10;
}
/**
* Url-encodes a string.
* All characters but A-Z, a-z, 0-9 and -_. are encoded by a percent sign followed by two hexadecimal digits.
*
* The space in encoded as `+` - this is correct for parts in the url _after_ the `?` and saves some bytes when used in QR codes.
* (in the URL _before_ the `?` or elsewhere, the space should be encoded as `%20`)
*
* Belongs to RFC 3986: https://tools.ietf.org/html/rfc3986#section-2
*
* Example: The string `Björn Petersen` will be encoded as `"Bj%C3%B6rn+Petersen`.
*
* @param to_encode Null-terminated UTF-8 string to encode.
* @return Returns a null-terminated url-encoded strings. The result must be free()'d when no longer needed.
* On memory allocation errors the program halts.
* On other errors, an empty string is returned.
*/
char* dc_urlencode(const char *to_encode)
{
const char *pstr = to_encode;
if (to_encode==NULL) {
return dc_strdup("");
}
char *buf = malloc(strlen(to_encode) * 3 + 1), *pbuf = buf;
if (buf==NULL) {
exit(46);
}
while (*pstr)
{
if (isalnum(*pstr) || *pstr=='-' || *pstr=='_' || *pstr=='.' || *pstr=='~') {
*pbuf++ = *pstr;
}
else if (*pstr==' ') {
*pbuf++ = '+';
}
else {
*pbuf++ = '%', *pbuf++ = int_2_uppercase_hex(*pstr >> 4), *pbuf++ = int_2_uppercase_hex(*pstr & 15);
}