/* Utility functions for converting various datatypes to text format (and
* later, for parsing them back, perhaps). */
+#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
using std::ostream;
using std::string;
+/* Like sprintf, but returns the output as an allocated string. */
+string string_printf(const char *fmt, ...)
+{
+ va_list args;
+ char *output = NULL;
+ string result;
+
+ va_start(args, fmt);
+ if (vasprintf(&output, fmt, args) < 0) {
+ /* TODO: Error signalling? */
+ return result;
+ }
+ result = output;
+ va_end(args);
+
+ free(output);
+ return result;
+}
+
/* Perform URI-style escaping of a string. Bytes which cannot be represented
* directly are encoded in the form %xx (where "xx" is a string of two
* hexadecimal digits). */
* advisory. For negative numbers, will always use decimal. */
string encode_int(long long n, int base)
{
- char buf[64];
-
- if (n >= 0 && base == 16) {
- sprintf(buf, "0x%llx", n);
- return buf;
- }
-
- if (n > 0 && base == 8) {
- sprintf(buf, "0%llo", n);
- return buf;
- }
-
- sprintf(buf, "%lld", n);
- return buf;
+ if (n >= 0 && base == 16)
+ return string_printf("0x%llx", n);
+ else if (n > 0 && base == 8)
+ return string_printf("0%llo", n);
+ else
+ return string_printf("%lld", n);
}
/* Parse the string representation of an integer. Accepts decimal, octal, and