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#define _GNU_SOURCE /* But only when HAVE_ASPRINTF */
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <string.h>
#include "xmlrpc_config.h" /* For HAVE_ASPRINTF, __inline__ */
#include "bool.h"
#include "casprintf.h"
static __inline__ void
newVsnprintf(char * const buffer,
size_t const bufferSize,
const char * const fmt,
va_list varargs,
size_t * const formattedSizeP) {
/*----------------------------------------------------------------------------
This is vsnprintf() with the new behavior, where not fitting in the buffer
is not a failure.
Unfortunately, we can't practically return the size of the formatted string
if the C library has old vsnprintf() and the formatted string doesn't fit
in the buffer, so in that case we just return something larger than the
buffer.
-----------------------------------------------------------------------------*/
if (bufferSize > INT_MAX/2) {
/* There's a danger we won't be able to coerce the return value
of XMLRPC_VSNPRINTF to an integer (which we have to do because,
while for POSIX its return value is ssize_t, on Windows it is int),
or return double the buffer size.
*/
*formattedSizeP = 0;
} else {
int rc;
rc = XMLRPC_VSNPRINTF(buffer, bufferSize, fmt, varargs);
if (rc < 0) {
/* We have old vsnprintf() (or Windows) and the formatted value
doesn't fit in the buffer, but we don't know how big a buffer it
needs.
*/
*formattedSizeP = bufferSize * 2;
} else {
/* Either the string fits in the buffer or we have new vsnprintf()
which tells us how big the string is regardless.
*/
*formattedSizeP = rc;
}
}
}
static __inline__ int
simpleVasprintf(char ** const resultP,
const char * const fmt,
va_list varargs) {
/*----------------------------------------------------------------------------
This is a poor man's implementation of vasprintf(), of GNU fame.
-----------------------------------------------------------------------------*/
int retval;
char * buffer;
size_t bufferSize;
bool outOfMemory;
for (buffer = NULL, bufferSize = 4096, outOfMemory = false;
!buffer && !outOfMemory;
) {
buffer = malloc(bufferSize);
if (!buffer)
outOfMemory = true;
else {
size_t bytesNeeded;
newVsnprintf(buffer, bufferSize, fmt, varargs, &bytesNeeded);
if (bytesNeeded > bufferSize) {
free(buffer);
buffer = NULL;
bufferSize = bytesNeeded;
}
}
}
if (outOfMemory)
retval = -1;
else {
retval = strlen(buffer);
*resultP = buffer;
}
return retval;
}
const char * const strsol = "[Insufficient memory to build string]";
void
cvasprintf(const char ** const retvalP,
const char * const fmt,
va_list varargs) {
char * string;
int rc;
#if HAVE_ASPRINTF
rc = vasprintf(&string, fmt, varargs);
#else
rc = simpleVasprintf(&string, fmt, varargs);
#endif
if (rc < 0)
*retvalP = strsol;
else
*retvalP = string;
}
void GNU_PRINTF_ATTR(2,3)
casprintf(const char ** const retvalP, const char * const fmt, ...) {
va_list varargs; /* mysterious structure used by variable arg facility */
va_start(varargs, fmt); /* start up the mysterious variable arg facility */
cvasprintf(retvalP, fmt, varargs);
va_end(varargs);
}
void
strfree(const char * const string) {
if (string != strsol)
free((void *)string);
}
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