/**
* prelude_string_vprintf:
* @string: Pointer to a #prelude_string_t object.
* @fmt: Format string to use.
* @ap: Variable argument list.
*
* Produce output according to @fmt, storing argument provided in @ap
* variable argument list, and write the output to the given @string.
* See sprintf(3) for more information on @fmt format.
*
* Returns: The number of characters written, or a negative value if an error occured.
*/
int prelude_string_vprintf(prelude_string_t *string, const char *fmt, va_list ap)
{
int ret;
va_list bkp;
prelude_return_val_if_fail(string, prelude_error(PRELUDE_ERROR_ASSERTION));
prelude_return_val_if_fail(fmt, prelude_error(PRELUDE_ERROR_ASSERTION));
if ( ! (string->flags & PRELUDE_STRING_OWN_DATA) ) {
ret = allocate_more_chunk_if_needed(string, 0);
if ( ret < 0 )
return ret;
}
PRELUDE_VA_COPY(bkp, ap);
ret = vsnprintf(string->data.rwbuf + string->index, string->size - string->index, fmt, ap);
/*
* From sprintf(3) on GNU/Linux:
*
* snprintf and vsnprintf do not write more than
* size bytes (including the trailing '\0'), and return -1 if
* the output was truncated due to this limit. (Thus until
* glibc 2.0.6. Since glibc 2.1 these functions follow the
* C99 standard and return the number of characters (exclud-
* ing the trailing '\0') which would have been written to
* the final string if enough space had been available.)
*/
if ( ret >= 0 && (size_t) ret < string->size - string->index ) {
string->index += ret;
goto end;
}
ret = allocate_more_chunk_if_needed(string, (ret < 0) ? 0 : ret + 1);
if ( ret < 0 )
goto end;
ret = prelude_string_vprintf(string, fmt, bkp);
end:
va_end(bkp);
return ret;
}
static void do_log_v(prelude_log_t level, const char *file,
const char *function, int line, const char *fmt, va_list ap)
{
int ret;
va_list bkp;
char buf[1024];
ssize_t len = 0;
if ( global_log_cb == do_log_print || global_log_cb == do_log_syslog ) {
len = get_header(level, buf, sizeof(buf));
if ( len < 0 )
return;
}
PRELUDE_VA_COPY(bkp, ap);
ret = vsnprintf(buf + len, sizeof(buf) - len, fmt, ap);
if ( ret < 0 || (size_t) ret >= (sizeof(buf) - len) )
goto out;
if ( level <= PRELUDE_LOG_ERR || level >= PRELUDE_LOG_DEBUG ) {
for ( len += ret; buf[len - 1] == '\n' ; len-- );
snprintf(buf + len, sizeof(buf) - len, " (%s:%d %s)\n", file, line, function);
}
if ( need_to_log(level, log_level) || need_to_log(level, debug_level) ) {
ret = global_log_cb(level, buf);
if ( ret < 0 && global_log_cb == do_log_print ) {
prelude_log_set_flags(PRELUDE_LOG_FLAGS_SYSLOG);
do_log_v(level, file, function, line, fmt, bkp);
goto out;
}
if ( debug_logfile )
fprintf(debug_logfile, "%s", buf);
}
out:
va_end(bkp);
}