summaryrefslogtreecommitdiff
path: root/dwm/resc/slstatus/util.c
diff options
context:
space:
mode:
authorJulian T <julian@jtle.dk>2023-09-23 12:23:10 +0200
committerJulian T <julian@jtle.dk>2023-09-23 12:23:10 +0200
commitf704caf68f69dfdc098746f66ab07222cf69b241 (patch)
treec643f238c3954e94e0fb3b904930c86b89b911e3 /dwm/resc/slstatus/util.c
parentf5a1f9e0dd92c645b39473376a2b9311a0f203cd (diff)
Add slstatus
Diffstat (limited to 'dwm/resc/slstatus/util.c')
-rw-r--r--dwm/resc/slstatus/util.c141
1 files changed, 141 insertions, 0 deletions
diff --git a/dwm/resc/slstatus/util.c b/dwm/resc/slstatus/util.c
new file mode 100644
index 0000000..bca9b2e
--- /dev/null
+++ b/dwm/resc/slstatus/util.c
@@ -0,0 +1,141 @@
+/* See LICENSE file for copyright and license details. */
+#include <errno.h>
+#include <stdarg.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "util.h"
+
+char *argv0;
+
+static void
+verr(const char *fmt, va_list ap)
+{
+ 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);
+}
+
+static int
+evsnprintf(char *str, size_t size, const char *fmt, va_list ap)
+{
+ int ret;
+
+ ret = vsnprintf(str, size, fmt, ap);
+
+ if (ret < 0) {
+ warn("vsnprintf:");
+ return -1;
+ } else if ((size_t)ret >= size) {
+ warn("vsnprintf: Output truncated");
+ return -1;
+ }
+
+ return ret;
+}
+
+int
+esnprintf(char *str, size_t size, const char *fmt, ...)
+{
+ va_list ap;
+ int ret;
+
+ va_start(ap, fmt);
+ ret = evsnprintf(str, size, fmt, ap);
+ va_end(ap);
+
+ return ret;
+}
+
+const char *
+bprintf(const char *fmt, ...)
+{
+ va_list ap;
+ int ret;
+
+ va_start(ap, fmt);
+ ret = evsnprintf(buf, sizeof(buf), fmt, ap);
+ va_end(ap);
+
+ return (ret < 0) ? NULL : buf;
+}
+
+const char *
+fmt_human(uintmax_t num, int base)
+{
+ double scaled;
+ size_t i, prefixlen;
+ const char **prefix;
+ const char *prefix_1000[] = { "", "k", "M", "G", "T", "P", "E", "Z",
+ "Y" };
+ const char *prefix_1024[] = { "", "Ki", "Mi", "Gi", "Ti", "Pi", "Ei",
+ "Zi", "Yi" };
+
+ switch (base) {
+ case 1000:
+ prefix = prefix_1000;
+ prefixlen = LEN(prefix_1000);
+ break;
+ case 1024:
+ prefix = prefix_1024;
+ prefixlen = LEN(prefix_1024);
+ break;
+ default:
+ warn("fmt_human: Invalid base");
+ return NULL;
+ }
+
+ scaled = num;
+ for (i = 0; i < prefixlen && scaled >= base; i++)
+ scaled /= base;
+
+ return bprintf("%.1f %s", scaled, prefix[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;
+}