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Add pscanf()

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This reduces a lot of equivalent code to one function call.
This commit is contained in:
Laslo Hunhold 2017-08-14 00:34:00 +02:00 committed by Aaron Marcher
parent 796b661284
commit e1e1b1d79a
No known key found for this signature in database
GPG Key ID: 74B048E5C2474F9A
1 changed files with 66 additions and 157 deletions
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223
slstatus.c
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@ -1,6 +1,7 @@
/* See LICENSE file for copyright and license details. */ /* See LICENSE file for copyright and license details. */
#include <dirent.h> #include <dirent.h>
#include <err.h> #include <err.h>
#include <errno.h>
#include <fcntl.h> #include <fcntl.h>
#include <ifaddrs.h> #include <ifaddrs.h>
#include <limits.h> #include <limits.h>
@ -93,52 +94,50 @@ bprintf(const char *fmt, ...)
return buf; return buf;
} }
int
pscanf(const char *path, const char *fmt, ...)
{
FILE *fp;
va_list ap;
int n;
if (!(fp = fopen(path, "r"))) {
warn("fopen %s: %s\n", path, strerror(errno));
return -1;
}
va_start(ap, fmt);
n = vfscanf(fp, fmt, ap);
va_end(ap);
fclose(fp);
return (n == EOF) ? -1 : n;
}
static const char * static const char *
battery_perc(const char *bat) battery_perc(const char *bat)
{ {
int n, perc; int perc;
char path[PATH_MAX]; char path[PATH_MAX];
FILE *fp;
snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/", bat, "/capacity"); snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/", bat, "/capacity");
fp = fopen(path, "r"); return (pscanf(path, "%i", &perc) == 1) ?
if (fp == NULL) { bprintf("%d", perc) : unknown_str;
warn("Failed to open file %s", path);
return unknown_str;
}
n = fscanf(fp, "%i", &perc);
fclose(fp);
if (n != 1)
return unknown_str;
return bprintf("%d", perc);
} }
static const char * static const char *
battery_power(const char *bat) battery_power(const char *bat)
{ {
int watts;
char path[PATH_MAX]; char path[PATH_MAX];
FILE *fp;
int n, watts;
snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/", bat, "/power_now"); snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/", bat, "/power_now");
fp = fopen(path, "r"); return (pscanf(path, "%i", &watts) == 1) ?
if (fp == NULL) { bprintf("%d", (watts + 500000) / 1000000) : unknown_str;
warn("Failed to open file %s", path);
return unknown_str;
}
n = fscanf(fp, "%i", &watts);
fclose(fp);
if (n != 1)
return unknown_str;
return bprintf("%d", (watts + 500000) / 1000000);
} }
static const char * static const char *
battery_state(const char *bat) battery_state(const char *bat)
{ {
FILE *fp;
struct { struct {
char *state; char *state;
char *symbol; char *symbol;
@ -149,81 +148,55 @@ battery_state(const char *bat)
{ "Unknown", "/" }, { "Unknown", "/" },
}; };
size_t i; size_t i;
int n;
char path[PATH_MAX], state[12]; char path[PATH_MAX], state[12];
snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/", bat, "/status"); snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/", bat, "/status");
fp = fopen(path, "r"); if (pscanf(path, "%12s", state) != 1) {
if (fp == NULL) {
warn("Failed to open file %s", path);
return unknown_str; return unknown_str;
} }
n = fscanf(fp, "%12s", state);
fclose(fp);
if (n != 1)
return unknown_str;
for (i = 0; i < LEN(map); i++) { for (i = 0; i < LEN(map); i++) {
if (!strcmp(map[i].state, state)) { if (!strcmp(map[i].state, state)) {
break; break;
} }
} }
return (i == LEN(map)) ? "?" : map[i].symbol; return (i == LEN(map)) ? "?" : map[i].symbol;
} }
static const char * static const char *
cpu_freq(void) cpu_freq(void)
{ {
int n, freq; int freq;
FILE *fp;
fp = fopen("/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq", "r"); return (pscanf("/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq",
if (fp == NULL) { "%i", &freq) != 1) ?
warn("Failed to open file /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq"); bprintf("%d", (freq + 500) / 1000) : unknown_str;
return unknown_str;
}
n = fscanf(fp, "%i", &freq);
fclose(fp);
if (n != 1)
return unknown_str;
return bprintf("%d", (freq + 500) / 1000);
} }
static const char * static const char *
cpu_perc(void) cpu_perc(void)
{ {
struct timespec delay; struct timespec delay;
int n, perc; int perc;
long double a[4], b[4]; long double a[4], b[4];
FILE *fp;
fp = fopen("/proc/stat", "r"); if (pscanf("/proc/stat", "%*s %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2],
if (fp == NULL) { &a[3]) != 4) {
warn("Failed to open file /proc/stat");
return unknown_str; return unknown_str;
} }
n = fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2], &a[3]);
fclose(fp);
if (n != 4)
return unknown_str;
delay.tv_sec = (interval / 2) / 1000; delay.tv_sec = (interval / 2) / 1000;
delay.tv_nsec = ((interval / 2) % 1000) * 1000000; delay.tv_nsec = ((interval / 2) % 1000) * 1000000;
nanosleep(&delay, NULL); nanosleep(&delay, NULL);
fp = fopen("/proc/stat", "r"); if (pscanf("/proc/stat", "%*s %Lf %Lf %Lf %Lf", &b[0], &b[1], &b[2],
if (fp == NULL) { &b[3]) != 4) {
warn("Failed to open file /proc/stat");
return unknown_str; return unknown_str;
} }
n = fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &b[0], &b[1], &b[2], &b[3]);
fclose(fp);
if (n != 4)
return unknown_str;
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])); 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]));
return bprintf("%d", perc); return bprintf("%d", perc);
} }
@ -297,20 +270,10 @@ disk_used(const char *mnt)
static const char * static const char *
entropy(void) entropy(void)
{ {
int n, num; int num;
FILE *fp;
fp= fopen("/proc/sys/kernel/random/entropy_avail", "r"); return (pscanf("/proc/sys/kernel/random/entropy_avail", "%d", &num) == 1) ?
if (fp == NULL) { bprintf("%d", num) : unknown_str;
warn("Failed to open file /proc/sys/kernel/random/entropy_avail");
return unknown_str;
}
n = fscanf(fp, "%d", &num);
fclose(fp);
if (n != 1)
return unknown_str;
return bprintf("%d", num);
} }
static const char * static const char *
@ -438,92 +401,48 @@ static const char *
ram_free(void) ram_free(void)
{ {
long free; long free;
FILE *fp;
int n;
fp = fopen("/proc/meminfo", "r"); return (pscanf("/proc/meminfo", "MemFree: %ld kB\n", &free) == 1) ?
if (fp == NULL) { bprintf("%f", (float)free / 1024 / 1024) : unknown_str;
warn("Failed to open file /proc/meminfo");
return unknown_str;
}
n = fscanf(fp, "MemFree: %ld kB\n", &free);
fclose(fp);
if (n != 1)
return unknown_str;
return bprintf("%f", (float)free / 1024 / 1024);
} }
static const char * static const char *
ram_perc(void) ram_perc(void)
{ {
long total, free, buffers, cached; long total, free, buffers, cached;
FILE *fp;
fp = fopen("/proc/meminfo", "r"); return (pscanf("/proc/meminfo",
if (fp == NULL) { "MemTotal: %ld kB\n"
warn("Failed to open file /proc/meminfo"); "MemFree: %ld kB\n"
return unknown_str; "MemAvailable: %ld kB\nBuffers: %ld kB\n"
} "Cached: %ld kB\n",
if (fscanf(fp, "MemTotal: %ld kB\n", &total) != 1 || &total, &free, &buffers, &buffers, &cached) == 5) ?
fscanf(fp, "MemFree: %ld kB\n", &free) != 1 || bprintf("%d", 100 * ((total - free) - (buffers + cached)) / total) :
fscanf(fp, "MemAvailable: %ld kB\nBuffers: %ld kB\n", unknown_str;
&buffers, &buffers) != 2 ||
fscanf(fp, "Cached: %ld kB\n", &cached) != 1)
goto scanerr;
fclose(fp);
return bprintf("%d", 100 * ((total - free) - (buffers + cached)) / total);
scanerr:
fclose(fp);
return unknown_str;
} }
static const char * static const char *
ram_total(void) ram_total(void)
{ {
long total; long total;
FILE *fp;
int n;
fp = fopen("/proc/meminfo", "r"); return (pscanf("/proc/meminfo", "MemTotal: %ld kB\n", &total) == 1) ?
if (fp == NULL) { bprintf("%f", (float)total / 1024 / 1024) : unknown_str;
warn("Failed to open file /proc/meminfo");
return unknown_str;
}
n = fscanf(fp, "MemTotal: %ld kB\n", &total);
fclose(fp);
if (n != 1)
return unknown_str;
return bprintf("%f", (float)total / 1024 / 1024);
} }
static const char * static const char *
ram_used(void) ram_used(void)
{ {
long free, total, buffers, cached; long total, free, buffers, cached;
FILE *fp;
fp = fopen("/proc/meminfo", "r"); return (pscanf("/proc/meminfo",
if (fp == NULL) { "MemTotal: %ld kB\n"
warn("Failed to open file /proc/meminfo"); "MemFree: %ld kB\n"
return unknown_str; "MemAvailable: %ld kB\nBuffers: %ld kB\n"
} "Cached: %ld kB\n",
if (fscanf(fp, "MemTotal: %ld kB\n", &total) != 1 || &total, &free, &buffers, &buffers, &cached) == 5) ?
fscanf(fp, "MemFree: %ld kB\n", &free) != 1 || bprintf("%f", (float)(total - free - buffers - cached) / 1024 / 1024) :
fscanf(fp, "MemAvailable: %ld kB\nBuffers: %ld kB\n", unknown_str;
&buffers, &buffers) != 2 ||
fscanf(fp, "Cached: %ld kB\n", &cached) != 1)
goto scanerr;
fclose(fp);
return bprintf("%f", (float)(total - free - buffers - cached) / 1024 / 1024);
scanerr:
fclose(fp);
return unknown_str;
} }
static const char * static const char *
@ -680,20 +599,10 @@ swap_used(void)
static const char * static const char *
temp(const char *file) temp(const char *file)
{ {
int n, temp; int temp;
FILE *fp;
fp = fopen(file, "r"); return (pscanf(file, "%d", &temp) == 1) ?
if (fp == NULL) { bprintf("%d", temp / 1000) : unknown_str;
warn("Failed to open file %s", file);
return unknown_str;
}
n = fscanf(fp, "%d", &temp);
fclose(fp);
if (n != 1)
return unknown_str;
return bprintf("%d", temp / 1000);
} }
static const char * static const char *