Add pscanf()
This reduces a lot of equivalent code to one function call.
This commit is contained in:
Laslo Hunhold
Aaron Marcher
parent
796b661284
commit
e1e1b1d79a
223
slstatus.c
223
slstatus.c
@ -1,6 +1,7 @@
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/* See LICENSE file for copyright and license details. */
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#include <dirent.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <ifaddrs.h>
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#include <limits.h>
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@ -93,52 +94,50 @@ bprintf(const char *fmt, ...)
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return buf;
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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: %s\n", path, strerror(errno));
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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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static const char *
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battery_perc(const char *bat)
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{
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int n, perc;
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int perc;
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char path[PATH_MAX];
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FILE *fp;
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snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/", bat, "/capacity");
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fp = fopen(path, "r");
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if (fp == NULL) {
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warn("Failed to open file %s", path);
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return unknown_str;
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}
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n = fscanf(fp, "%i", &perc);
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fclose(fp);
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if (n != 1)
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return unknown_str;
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return bprintf("%d", perc);
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return (pscanf(path, "%i", &perc) == 1) ?
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bprintf("%d", perc) : unknown_str;
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}
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static const char *
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battery_power(const char *bat)
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{
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int watts;
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char path[PATH_MAX];
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FILE *fp;
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int n, watts;
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snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/", bat, "/power_now");
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fp = fopen(path, "r");
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if (fp == NULL) {
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warn("Failed to open file %s", path);
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return unknown_str;
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}
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n = fscanf(fp, "%i", &watts);
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fclose(fp);
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if (n != 1)
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return unknown_str;
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return bprintf("%d", (watts + 500000) / 1000000);
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return (pscanf(path, "%i", &watts) == 1) ?
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bprintf("%d", (watts + 500000) / 1000000) : unknown_str;
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}
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static const char *
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battery_state(const char *bat)
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{
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FILE *fp;
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struct {
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char *state;
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char *symbol;
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@ -149,81 +148,55 @@ battery_state(const char *bat)
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{ "Unknown", "/" },
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};
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size_t i;
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int n;
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char path[PATH_MAX], state[12];
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snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/", bat, "/status");
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fp = fopen(path, "r");
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if (fp == NULL) {
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warn("Failed to open file %s", path);
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if (pscanf(path, "%12s", state) != 1) {
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return unknown_str;
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}
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n = fscanf(fp, "%12s", state);
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fclose(fp);
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if (n != 1)
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return unknown_str;
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for (i = 0; i < LEN(map); i++) {
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if (!strcmp(map[i].state, state)) {
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break;
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}
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}
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return (i == LEN(map)) ? "?" : map[i].symbol;
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}
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static const char *
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cpu_freq(void)
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{
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int n, freq;
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FILE *fp;
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int freq;
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fp = fopen("/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq", "r");
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if (fp == NULL) {
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warn("Failed to open file /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq");
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return unknown_str;
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}
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n = fscanf(fp, "%i", &freq);
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fclose(fp);
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if (n != 1)
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return unknown_str;
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return bprintf("%d", (freq + 500) / 1000);
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return (pscanf("/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq",
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"%i", &freq) != 1) ?
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bprintf("%d", (freq + 500) / 1000) : unknown_str;
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}
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static const char *
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cpu_perc(void)
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{
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struct timespec delay;
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int n, perc;
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int perc;
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long double a[4], b[4];
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FILE *fp;
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fp = fopen("/proc/stat", "r");
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if (fp == NULL) {
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warn("Failed to open file /proc/stat");
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if (pscanf("/proc/stat", "%*s %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2],
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&a[3]) != 4) {
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return unknown_str;
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}
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n = fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2], &a[3]);
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fclose(fp);
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if (n != 4)
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return unknown_str;
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delay.tv_sec = (interval / 2) / 1000;
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delay.tv_nsec = ((interval / 2) % 1000) * 1000000;
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nanosleep(&delay, NULL);
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fp = fopen("/proc/stat", "r");
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if (fp == NULL) {
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warn("Failed to open file /proc/stat");
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if (pscanf("/proc/stat", "%*s %Lf %Lf %Lf %Lf", &b[0], &b[1], &b[2],
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&b[3]) != 4) {
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return unknown_str;
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}
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n = fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &b[0], &b[1], &b[2], &b[3]);
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fclose(fp);
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if (n != 4)
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return unknown_str;
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perc = 100 * ((b[0]+b[1]+b[2]) - (a[0]+a[1]+a[2])) / ((b[0]+b[1]+b[2]+b[3]) - (a[0]+a[1]+a[2]+a[3]));
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perc = 100 * ((b[0]+b[1]+b[2]) - (a[0]+a[1]+a[2])) /
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((b[0]+b[1]+b[2]+b[3]) - (a[0]+a[1]+a[2]+a[3]));
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return bprintf("%d", perc);
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}
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@ -297,20 +270,10 @@ disk_used(const char *mnt)
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static const char *
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entropy(void)
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{
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int n, num;
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FILE *fp;
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int num;
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fp= fopen("/proc/sys/kernel/random/entropy_avail", "r");
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if (fp == NULL) {
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warn("Failed to open file /proc/sys/kernel/random/entropy_avail");
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return unknown_str;
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}
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n = fscanf(fp, "%d", &num);
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fclose(fp);
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if (n != 1)
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return unknown_str;
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return bprintf("%d", num);
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return (pscanf("/proc/sys/kernel/random/entropy_avail", "%d", &num) == 1) ?
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bprintf("%d", num) : unknown_str;
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}
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static const char *
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@ -438,92 +401,48 @@ static const char *
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ram_free(void)
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{
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long free;
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FILE *fp;
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int n;
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fp = fopen("/proc/meminfo", "r");
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if (fp == NULL) {
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warn("Failed to open file /proc/meminfo");
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return unknown_str;
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}
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n = fscanf(fp, "MemFree: %ld kB\n", &free);
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fclose(fp);
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if (n != 1)
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return unknown_str;
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return bprintf("%f", (float)free / 1024 / 1024);
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return (pscanf("/proc/meminfo", "MemFree: %ld kB\n", &free) == 1) ?
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bprintf("%f", (float)free / 1024 / 1024) : unknown_str;
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}
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static const char *
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ram_perc(void)
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{
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long total, free, buffers, cached;
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FILE *fp;
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fp = fopen("/proc/meminfo", "r");
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if (fp == NULL) {
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warn("Failed to open file /proc/meminfo");
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return unknown_str;
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}
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if (fscanf(fp, "MemTotal: %ld kB\n", &total) != 1 ||
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fscanf(fp, "MemFree: %ld kB\n", &free) != 1 ||
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fscanf(fp, "MemAvailable: %ld kB\nBuffers: %ld kB\n",
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&buffers, &buffers) != 2 ||
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fscanf(fp, "Cached: %ld kB\n", &cached) != 1)
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goto scanerr;
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fclose(fp);
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return bprintf("%d", 100 * ((total - free) - (buffers + cached)) / total);
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scanerr:
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fclose(fp);
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return unknown_str;
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return (pscanf("/proc/meminfo",
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"MemTotal: %ld kB\n"
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"MemFree: %ld kB\n"
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"MemAvailable: %ld kB\nBuffers: %ld kB\n"
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"Cached: %ld kB\n",
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&total, &free, &buffers, &buffers, &cached) == 5) ?
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bprintf("%d", 100 * ((total - free) - (buffers + cached)) / total) :
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unknown_str;
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}
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static const char *
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ram_total(void)
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{
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long total;
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FILE *fp;
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int n;
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fp = fopen("/proc/meminfo", "r");
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if (fp == NULL) {
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warn("Failed to open file /proc/meminfo");
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return unknown_str;
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}
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n = fscanf(fp, "MemTotal: %ld kB\n", &total);
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fclose(fp);
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if (n != 1)
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return unknown_str;
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return bprintf("%f", (float)total / 1024 / 1024);
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return (pscanf("/proc/meminfo", "MemTotal: %ld kB\n", &total) == 1) ?
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bprintf("%f", (float)total / 1024 / 1024) : unknown_str;
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}
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static const char *
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ram_used(void)
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{
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long free, total, buffers, cached;
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FILE *fp;
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long total, free, buffers, cached;
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fp = fopen("/proc/meminfo", "r");
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if (fp == NULL) {
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warn("Failed to open file /proc/meminfo");
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return unknown_str;
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}
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if (fscanf(fp, "MemTotal: %ld kB\n", &total) != 1 ||
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fscanf(fp, "MemFree: %ld kB\n", &free) != 1 ||
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fscanf(fp, "MemAvailable: %ld kB\nBuffers: %ld kB\n",
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&buffers, &buffers) != 2 ||
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fscanf(fp, "Cached: %ld kB\n", &cached) != 1)
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goto scanerr;
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fclose(fp);
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return bprintf("%f", (float)(total - free - buffers - cached) / 1024 / 1024);
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scanerr:
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fclose(fp);
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return unknown_str;
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return (pscanf("/proc/meminfo",
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"MemTotal: %ld kB\n"
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"MemFree: %ld kB\n"
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"MemAvailable: %ld kB\nBuffers: %ld kB\n"
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"Cached: %ld kB\n",
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&total, &free, &buffers, &buffers, &cached) == 5) ?
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bprintf("%f", (float)(total - free - buffers - cached) / 1024 / 1024) :
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unknown_str;
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}
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static const char *
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@ -680,20 +599,10 @@ swap_used(void)
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static const char *
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temp(const char *file)
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{
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int n, temp;
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FILE *fp;
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int temp;
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fp = fopen(file, "r");
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if (fp == NULL) {
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warn("Failed to open file %s", file);
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return unknown_str;
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}
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n = fscanf(fp, "%d", &temp);
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fclose(fp);
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if (n != 1)
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return unknown_str;
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return bprintf("%d", temp / 1000);
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return (pscanf(file, "%d", &temp) == 1) ?
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bprintf("%d", temp / 1000) : unknown_str;
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}
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static const char *
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