145 lines
2.3 KiB
C
145 lines
2.3 KiB
C
/* See LICENSE file for copyright and license details. */
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#include <errno.h>
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#include <stdarg.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "util.h"
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char *argv0;
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static void
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verr(const char *fmt, va_list ap)
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{
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if (argv0 && strncmp(fmt, "usage", sizeof("usage") - 1)) {
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fprintf(stderr, "%s: ", argv0);
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}
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vfprintf(stderr, fmt, ap);
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if (fmt[0] && fmt[strlen(fmt) - 1] == ':') {
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fputc(' ', stderr);
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perror(NULL);
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} else {
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fputc('\n', stderr);
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}
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}
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void
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warn(const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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verr(fmt, ap);
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va_end(ap);
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}
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void
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die(const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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verr(fmt, ap);
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va_end(ap);
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exit(1);
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}
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static int
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evsnprintf(char *str, size_t size, const char *fmt, va_list ap)
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{
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int ret;
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ret = vsnprintf(str, size, fmt, ap);
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if (ret < 0) {
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warn("vsnprintf:");
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return -1;
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} else if ((size_t)ret >= size) {
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warn("vsnprintf: Output truncated");
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return -1;
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}
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return ret;
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}
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int
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esnprintf(char *str, size_t size, const char *fmt, ...)
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{
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va_list ap;
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int ret;
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va_start(ap, fmt);
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ret = evsnprintf(str, size, fmt, ap);
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va_end(ap);
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return ret;
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}
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const char *
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bprintf(const char *fmt, ...)
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{
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va_list ap;
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int ret;
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va_start(ap, fmt);
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ret = evsnprintf(buf, sizeof(buf), fmt, ap);
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va_end(ap);
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return (ret < 0) ? NULL : buf;
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}
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const char *
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fmt_human(uint64_t num, int base)
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{
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double scaled;
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size_t i, prefixlen;
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const char **prefix;
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const char *prefix_1000[] = { "", "k", "M", "G", "T", "P", "E", "Z", "Y" };
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const char *prefix_1024[] = { "", "Ki", "Mi", "Gi", "Ti", "Pi", "Ei",
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"Zi", "Yi" };
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switch (base) {
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case 1000:
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prefix = prefix_1000;
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prefixlen = LEN(prefix_1000);
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break;
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case 1024:
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prefix = prefix_1024;
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prefixlen = LEN(prefix_1024);
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break;
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default:
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warn("fmt_human: Invalid base");
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return NULL;
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}
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scaled = num;
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for (i = 0; i < prefixlen && scaled >= base; i++) {
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scaled /= base;
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}
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return bprintf("%.1f%s", scaled, prefix[i]);
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}
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int
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pscanf(const char *path, const char *fmt, ...)
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{
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FILE *fp;
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va_list ap;
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int n;
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if (!(fp = fopen(path, "r"))) {
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warn("fopen '%s':", path);
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return -1;
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}
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va_start(ap, fmt);
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n = vfscanf(fp, fmt, ap);
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va_end(ap);
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fclose(fp);
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return (n == EOF) ? -1 : n;
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}
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