Man Pages – Linux Manual Pages

dprintf, vdprintf – print to a file descriptor
USAGE
#define _GNU_SOURCE
#include <stdio.h>

int dprintf(int fd, const char *format, …);

int vdprintf(int fd, const char *format, va_list ap);

DESCRIPTION
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nprintf, curl_mvsprintf – formatted output conversion
USAGE
#include <curl/mprintf.h>

int curl_mprintf(const char *format, …);
int curl_mfprintf(FILE *fd, const char *format, …);
int curl_msprintf(char *buffer, const char *format, …);
[...]

asprintf, vasprintf – print to allocated string
USAGE
#define _GNU_SOURCE
#include <stdio.h>

int asprintf(char **strp, const char *fmt, …);

int vasprintf(char **strp, const char *fmt, va_list ap);

DESCRIPTION
[...]