slstatus/util.c
Laslo Hunhold 422cadfd5f Implement esnprintf() and make formatted calls more efficient
Within the components, snprintf() was unchecked and had inefficient
calls in some places.
We implement esnprintf() that does all the dirty laundry for us
and use it exclusively now.
2018-05-19 19:44:02 +02:00

123 lines
1.8 KiB
C

/* See LICENSE file for copyright and license details. */
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "util.h"
char *argv0;
static void
verr(const char *fmt, va_list ap)
{
if (argv0 && strncmp(fmt, "usage", sizeof("usage") - 1)) {
fprintf(stderr, "%s: ", argv0);
}
vfprintf(stderr, fmt, ap);
if (fmt[0] && fmt[strlen(fmt) - 1] == ':') {
fputc(' ', stderr);
perror(NULL);
} else {
fputc('\n', stderr);
}
}
void
warn(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
verr(fmt, ap);
va_end(ap);
}
void
die(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
verr(fmt, ap);
va_end(ap);
exit(1);
}
int
esnprintf(char *str, size_t size, const char *fmt, ...)
{
va_list ap;
int ret;
va_start(ap, fmt);
ret = vsnprintf(str, size, fmt, ap);
va_end(ap);
if (ret < 0) {
warn("snprintf:");
return -1;
} else if ((size_t)ret >= size) {
warn("snprintf: Output truncated");
return -1;
}
return ret;
}
const char *
bprintf(const char *fmt, ...)
{
va_list ap;
int ret;
va_start(ap, fmt);
if ((ret = vsnprintf(buf, sizeof(buf), fmt, ap)) < 0) {
warn("vsnprintf:");
} else if ((size_t)ret >= sizeof(buf)) {
warn("vsnprintf: Output truncated");
}
va_end(ap);
return buf;
}
const char *
fmt_scaled(size_t bytes)
{
unsigned int i;
float scaled;
const char *units[] = { "B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB",
"ZiB", "YiB" };
scaled = bytes;
for (i = 0; i < LEN(units) && scaled >= 1024; i++) {
scaled /= 1024.0;
}
return bprintf("%.1f%s", scaled, units[i]);
}
int
pscanf(const char *path, const char *fmt, ...)
{
FILE *fp;
va_list ap;
int n;
if (!(fp = fopen(path, "r"))) {
warn("fopen '%s':", path);
return -1;
}
va_start(ap, fmt);
n = vfscanf(fp, fmt, ap);
va_end(ap);
fclose(fp);
return (n == EOF) ? -1 : n;
}