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Format error messages properly 

Make use of strerror(errno) and format all errors equally:
function ['parameters']: error message
This commit is contained in:
Aaron Marcher 2018-03-28 19:46:27 +02:00
parent 2289798b6d
commit faa52bdcc0
15 changed files with 55 additions and 33 deletions
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6
components/battery.c
View File

@ -1,5 +1,7 @@
/* See LICENSE file for copyright and license details. */ /* See LICENSE file for copyright and license details. */
#include <errno.h>
#include <stdio.h> #include <stdio.h>
#include <string.h>
#if defined(__linux__) #if defined(__linux__)
#include <limits.h> #include <limits.h>
#include <string.h> #include <string.h>
@ -28,12 +30,12 @@ battery_perc(const char *bat)
fd = open("/dev/apm", O_RDONLY); fd = open("/dev/apm", O_RDONLY);
if (fd < 0) { if (fd < 0) {
fprintf(stderr, "Failed to open file /dev/apm"); fprintf(stderr, "open '/dev/apm': %s\n", strerror(errno));
return NULL; return NULL;
} }
if (ioctl(fd, APM_IOC_GETPOWER, &apm_info) < 0) { if (ioctl(fd, APM_IOC_GETPOWER, &apm_info) < 0) {
fprintf(stderr, "Failed to get battery info"); fprintf(stderr, "ioctl 'APM_IOC_GETPOWER': %s\n", strerror(errno));
close(fd); close(fd);
return NULL; return NULL;
} }

10
components/disk.c
View File

@ -1,5 +1,7 @@
/* See LICENSE file for copyright and license details. */ /* See LICENSE file for copyright and license details. */
#include <errno.h>
#include <stdio.h> #include <stdio.h>
#include <string.h>
#include <sys/statvfs.h> #include <sys/statvfs.h>
#include "../util.h" #include "../util.h"
@ -10,7 +12,7 @@ disk_free(const char *mnt)
struct statvfs fs; struct statvfs fs;
if (statvfs(mnt, &fs) < 0) { if (statvfs(mnt, &fs) < 0) {
fprintf(stderr, "Failed to get filesystem info"); fprintf(stderr, "statvfs '%s': %s\n", mnt, strerror(errno));
return NULL; return NULL;
} }
@ -24,7 +26,7 @@ disk_perc(const char *mnt)
struct statvfs fs; struct statvfs fs;
if (statvfs(mnt, &fs) < 0) { if (statvfs(mnt, &fs) < 0) {
fprintf(stderr, "Failed to get filesystem info"); fprintf(stderr, "statvfs '%s': %s\n", mnt, strerror(errno));
return NULL; return NULL;
} }
@ -39,7 +41,7 @@ disk_total(const char *mnt)
struct statvfs fs; struct statvfs fs;
if (statvfs(mnt, &fs) < 0) { if (statvfs(mnt, &fs) < 0) {
fprintf(stderr, "Failed to get filesystem info"); fprintf(stderr, "statvfs '%s': %s\n", mnt, strerror(errno));
return NULL; return NULL;
} }
@ -52,7 +54,7 @@ disk_used(const char *mnt)
struct statvfs fs; struct statvfs fs;
if (statvfs(mnt, &fs) < 0) { if (statvfs(mnt, &fs) < 0) {
fprintf(stderr, "Failed to get filesystem info"); fprintf(stderr, "statvfs '%s': %s\n", mnt, strerror(errno));
return NULL; return NULL;
} }

4
components/hostname.c
View File

@ -1,5 +1,7 @@
/* See LICENSE file for copyright and license details. */ /* See LICENSE file for copyright and license details. */
#include <errno.h>
#include <stdio.h> #include <stdio.h>
#include <string.h>
#include <unistd.h> #include <unistd.h>
#include "../util.h" #include "../util.h"
@ -8,7 +10,7 @@ const char *
hostname(void) hostname(void)
{ {
if (gethostname(buf, sizeof(buf)) == -1) { if (gethostname(buf, sizeof(buf)) == -1) {
fprintf(stderr, "gethostbyname failed"); fprintf(stderr, "gethostbyname: %s\n", strerror(errno));
return NULL; return NULL;
} }

9
components/ip.c
View File

@ -1,5 +1,6 @@
/* See LICENSE file for copyright and license details. */ /* See LICENSE file for copyright and license details. */
#if defined(__linux__) #if defined(__linux__)
#include <errno.h>
#include <ifaddrs.h> #include <ifaddrs.h>
#include <netdb.h> #include <netdb.h>
#include <stdio.h> #include <stdio.h>
@ -15,7 +16,7 @@ ipv4(const char *iface)
char host[NI_MAXHOST]; char host[NI_MAXHOST];
if (getifaddrs(&ifaddr) == -1) { if (getifaddrs(&ifaddr) == -1) {
fprintf(stderr, "Failed to get IPv4 address for interface %s", iface); fprintf(stderr, "getifaddrs: %s\n", strerror(errno));
return NULL; return NULL;
} }
@ -26,7 +27,7 @@ ipv4(const char *iface)
s = getnameinfo(ifa->ifa_addr, sizeof(struct sockaddr_in), host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST); s = getnameinfo(ifa->ifa_addr, sizeof(struct sockaddr_in), host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
if ((strcmp(ifa->ifa_name, iface) == 0) && (ifa->ifa_addr->sa_family == AF_INET)) { if ((strcmp(ifa->ifa_name, iface) == 0) && (ifa->ifa_addr->sa_family == AF_INET)) {
if (s != 0) { if (s != 0) {
fprintf(stderr, "Failed to get IPv4 address for interface %s", iface); fprintf(stderr, "getnameinfo: %s\n", gai_strerror(s));
return NULL; return NULL;
} }
return bprintf("%s", host); return bprintf("%s", host);
@ -46,7 +47,7 @@ ipv6(const char *iface)
char host[NI_MAXHOST]; char host[NI_MAXHOST];
if (getifaddrs(&ifaddr) == -1) { if (getifaddrs(&ifaddr) == -1) {
fprintf(stderr, "Failed to get IPv6 address for interface %s", iface); fprintf(stderr, "getifaddrs: %s\n", strerror(errno));
return NULL; return NULL;
} }
@ -57,7 +58,7 @@ ipv6(const char *iface)
s = getnameinfo(ifa->ifa_addr, sizeof(struct sockaddr_in6), host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST); s = getnameinfo(ifa->ifa_addr, sizeof(struct sockaddr_in6), host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
if ((strcmp(ifa->ifa_name, iface) == 0) && (ifa->ifa_addr->sa_family == AF_INET6)) { if ((strcmp(ifa->ifa_name, iface) == 0) && (ifa->ifa_addr->sa_family == AF_INET6)) {
if (s != 0) { if (s != 0) {
fprintf(stderr, "Failed to get IPv6 address for interface %s", iface); fprintf(stderr, "getnameinfo: %s\n", gai_strerror(s));
return NULL; return NULL;
} }
return bprintf("%s", host); return bprintf("%s", host);

3
components/kernel_release.c
View File

@ -1,6 +1,8 @@
/* See LICENSE file for copyright and license details. */ /* See LICENSE file for copyright and license details. */
#include <errno.h>
#include <sys/utsname.h> #include <sys/utsname.h>
#include <stdio.h> #include <stdio.h>
#include <string.h>
#include "../util.h" #include "../util.h"
@ -10,6 +12,7 @@ kernel_release(void)
struct utsname udata; struct utsname udata;
if (uname(&udata) < 0) { if (uname(&udata) < 0) {
fprintf(stderr, "uname: %s\n", strerror(errno));
return NULL; return NULL;
} }

2
components/keyboard_indicators.c
View File

@ -11,7 +11,7 @@ keyboard_indicators(void)
XKeyboardState state; XKeyboardState state;
if (dpy == NULL) { if (dpy == NULL) {
fprintf(stderr, "Cannot open display"); fprintf(stderr, "Cannot open display\n");
return NULL; return NULL;
} }
XGetKeyboardControl(dpy, &state); XGetKeyboardControl(dpy, &state);

2
components/load_avg.c
View File

@ -10,7 +10,7 @@ load_avg(const char *fmt)
double avgs[3]; double avgs[3];
if (getloadavg(avgs, 3) < 0) { if (getloadavg(avgs, 3) < 0) {
fprintf(stderr, "Failed to get the load avg"); fprintf(stderr, "getloadavg: Could not obtain load average.\n");
return NULL; return NULL;
} }

3
components/num_files.c
View File

@ -1,4 +1,5 @@
/* See LICENSE file for copyright and license details. */ /* See LICENSE file for copyright and license details. */
#include <errno.h>
#include <dirent.h> #include <dirent.h>
#include <stdio.h> #include <stdio.h>
#include <string.h> #include <string.h>
@ -13,7 +14,7 @@ num_files(const char *dir)
int num = 0; int num = 0;
if ((fd = opendir(dir)) == NULL) { if ((fd = opendir(dir)) == NULL) {
fprintf(stderr, "Failed to get number of files in directory %s", dir); fprintf(stderr, "opendir '%s': %s\n", dir, strerror(errno));
return NULL; return NULL;
} }

3
components/run_command.c
View File

@ -1,4 +1,5 @@
/* See LICENSE file for copyright and license details. */ /* See LICENSE file for copyright and license details. */
#include <errno.h>
#include <stdio.h> #include <stdio.h>
#include <string.h> #include <string.h>
@ -12,7 +13,7 @@ run_command(const char *cmd)
fp = popen(cmd, "r"); fp = popen(cmd, "r");
if (fp == NULL) { if (fp == NULL) {
fprintf(stderr, "Failed to get command output for %s", cmd); fprintf(stderr, "popen '%s': %s\n", cmd, strerror(errno));
return NULL; return NULL;
} }
p = fgets(buf, sizeof(buf) - 1, fp); p = fgets(buf, sizeof(buf) - 1, fp);

17
components/swap.c
View File

@ -1,5 +1,6 @@
/* See LICENSE file for copyright and license details. */ /* See LICENSE file for copyright and license details. */
#if defined(__linux__) #if defined(__linux__)
#include <errno.h>
#include <stdio.h> #include <stdio.h>
#include <string.h> #include <string.h>
@ -15,12 +16,12 @@ swap_free(void)
fp = fopen("/proc/meminfo", "r"); fp = fopen("/proc/meminfo", "r");
if (fp == NULL) { if (fp == NULL) {
fprintf(stderr, "Failed to open file /proc/meminfo"); fprintf(stderr, "fopen '/proc/meminfo': %s\n", strerror(errno));
return NULL; return NULL;
} }
if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) { if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
fprintf(stderr, "swap_free: read error"); fprintf(stderr, "fread '/proc/meminfo': %s\n", strerror(errno));
fclose(fp); fclose(fp);
return NULL; return NULL;
} }
@ -47,12 +48,12 @@ swap_perc(void)
fp = fopen("/proc/meminfo", "r"); fp = fopen("/proc/meminfo", "r");
if (fp == NULL) { if (fp == NULL) {
fprintf(stderr, "Failed to open file /proc/meminfo"); fprintf(stderr, "fopen '/proc/meminfo': %s\n", strerror(errno));
return NULL; return NULL;
} }
if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) { if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
fprintf(stderr, "swap_perc: read error"); fprintf(stderr, "fread '/proc/meminfo': %s\n", strerror(errno));
fclose(fp); fclose(fp);
return NULL; return NULL;
} }
@ -83,11 +84,11 @@ swap_total(void)
fp = fopen("/proc/meminfo", "r"); fp = fopen("/proc/meminfo", "r");
if (fp == NULL) { if (fp == NULL) {
fprintf(stderr, "Failed to open file /proc/meminfo"); fprintf(stderr, "fopen '/proc/meminfo': %s\n", strerror(errno));
return NULL; return NULL;
} }
if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) { if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
fprintf(stderr, "swap_total: read error"); fprintf(stderr, "fread '/proc/meminfo': %s\n", strerror(errno));
fclose(fp); fclose(fp);
return NULL; return NULL;
} }
@ -110,11 +111,11 @@ swap_used(void)
fp = fopen("/proc/meminfo", "r"); fp = fopen("/proc/meminfo", "r");
if (fp == NULL) { if (fp == NULL) {
fprintf(stderr, "Failed to open file /proc/meminfo"); fprintf(stderr, "fopen '/proc/meminfo': %s\n", strerror(errno));
return NULL; return NULL;
} }
if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) { if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
fprintf(stderr, "swap_used: read error"); fprintf(stderr, "fread '/proc/meminfo': %s\n", strerror(errno));
fclose(fp); fclose(fp);
return NULL; return NULL;
} }

6
components/uptime.c
View File

@ -1,5 +1,7 @@
/* See LICENSE file for copyright and license details. */ /* See LICENSE file for copyright and license details. */
#include <errno.h>
#include <stdio.h> #include <stdio.h>
#include <string.h>
#if defined(__linux__) #if defined(__linux__)
#include <sys/sysinfo.h> #include <sys/sysinfo.h>
#elif defined(__OpenBSD__) #elif defined(__OpenBSD__)
@ -35,8 +37,10 @@ uptime(void)
if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1) if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1)
uptime = now - boottime.tv_sec; uptime = now - boottime.tv_sec;
else else {
fprintf(stderr, "sysctl 'KERN_BOOTTIME': %s\n", strerror(errno));
return NULL; return NULL;
}
#endif #endif
h = uptime / 3600; h = uptime / 3600;
m = (uptime - h * 3600) / 60; m = (uptime - h * 3600) / 60;

4
components/user.c
View File

@ -1,6 +1,8 @@
/* See LICENSE file for copyright and license details. */ /* See LICENSE file for copyright and license details. */
#include <errno.h>
#include <pwd.h> #include <pwd.h>
#include <stdio.h> #include <stdio.h>
#include <string.h>
#include <sys/types.h> #include <sys/types.h>
#include <unistd.h> #include <unistd.h>
@ -18,7 +20,7 @@ username(void)
struct passwd *pw = getpwuid(geteuid()); struct passwd *pw = getpwuid(geteuid());
if (pw == NULL) { if (pw == NULL) {
fprintf(stderr, "Failed to get username"); fprintf(stderr, "getpwuid '%d': %s\n", geteuid(), strerror(errno));
return NULL; return NULL;
} }

7
components/volume.c
View File

@ -1,5 +1,6 @@
/* See LICENSE file for copyright and license details. */ /* See LICENSE file for copyright and license details. */
#if defined(__linux__) #if defined(__linux__)
#include <errno.h>
#include <fcntl.h> #include <fcntl.h>
#include <sys/soundcard.h> #include <sys/soundcard.h>
#include <sys/ioctl.h> #include <sys/ioctl.h>
@ -18,19 +19,19 @@ vol_perc(const char *card)
afd = open(card, O_RDONLY | O_NONBLOCK); afd = open(card, O_RDONLY | O_NONBLOCK);
if (afd == -1) { if (afd == -1) {
fprintf(stderr, "Cannot open %s", card); fprintf(stderr, "open '%s': %s\n", card, strerror(errno));
return NULL; return NULL;
} }
if (ioctl(afd, SOUND_MIXER_READ_DEVMASK, &devmask) == -1) { if (ioctl(afd, SOUND_MIXER_READ_DEVMASK, &devmask) == -1) {
fprintf(stderr, "Cannot get volume for %s", card); fprintf(stderr, "ioctl 'SOUND_MIXER_READ_DEVMASK': %s\n", strerror(errno));
close(afd); close(afd);
return NULL; return NULL;
} }
for (i = 0; i < LEN(vnames); i++) { for (i = 0; i < LEN(vnames); i++) {
if (devmask & (1 << i) && !strcmp("vol", vnames[i])) { if (devmask & (1 << i) && !strcmp("vol", vnames[i])) {
if (ioctl(afd, MIXER_READ(i), &v) == -1) { if (ioctl(afd, MIXER_READ(i), &v) == -1) {
fprintf(stderr, "vol_perc: ioctl"); fprintf(stderr, "ioctl 'MIXER_READ(%d)': %s\n", i, strerror(errno));
close(afd); close(afd);
return NULL; return NULL;
} }

9
components/wifi.c
View File

@ -1,5 +1,6 @@
/* See LICENSE file for copyright and license details. */ /* See LICENSE file for copyright and license details. */
#if defined(__linux__) #if defined(__linux__)
#include <errno.h>
#include <ifaddrs.h> #include <ifaddrs.h>
#include <linux/wireless.h> #include <linux/wireless.h>
#include <sys/socket.h> #include <sys/socket.h>
@ -25,7 +26,7 @@ wifi_perc(const char *iface)
snprintf(path, sizeof(path), "%s%s%s", "/sys/class/net/", iface, "/operstate"); snprintf(path, sizeof(path), "%s%s%s", "/sys/class/net/", iface, "/operstate");
fp = fopen(path, "r"); fp = fopen(path, "r");
if (fp == NULL) { if (fp == NULL) {
fprintf(stderr, "Failed to open file %s", path); fprintf(stderr, "fopen '%s': %s\n", path, strerror(errno));
return NULL; return NULL;
} }
p = fgets(status, 5, fp); p = fgets(status, 5, fp);
@ -36,7 +37,7 @@ wifi_perc(const char *iface)
fp = fopen("/proc/net/wireless", "r"); fp = fopen("/proc/net/wireless", "r");
if (fp == NULL) { if (fp == NULL) {
fprintf(stderr, "Failed to open file /proc/net/wireless"); fprintf(stderr, "fopen '/proc/net/wireless': %s\n", strerror(errno));
return NULL; return NULL;
} }
@ -71,12 +72,12 @@ wifi_essid(const char *iface)
snprintf(wreq.ifr_name, sizeof(wreq.ifr_name), "%s", iface); snprintf(wreq.ifr_name, sizeof(wreq.ifr_name), "%s", iface);
if (sockfd == -1) { if (sockfd == -1) {
fprintf(stderr, "Failed to get ESSID for interface %s", iface); fprintf(stderr, "socket 'AF_INET': %s\n", strerror(errno));
return NULL; return NULL;
} }
wreq.u.essid.pointer = id; wreq.u.essid.pointer = id;
if (ioctl(sockfd,SIOCGIWESSID, &wreq) == -1) { if (ioctl(sockfd,SIOCGIWESSID, &wreq) == -1) {
fprintf(stderr, "Failed to get ESSID for interface %s", iface); fprintf(stderr, "ioctl 'SIOCGIWESSID': %s\n", strerror(errno));
close(sockfd); close(sockfd);
return NULL; return NULL;
} }

3
util.c
View File

@ -1,4 +1,5 @@
/* See LICENSE file for copyright and license details. */ /* See LICENSE file for copyright and license details. */
#include <errno.h>
#include <stdarg.h> #include <stdarg.h>
#include <stdio.h> #include <stdio.h>
#include <string.h> #include <string.h>
@ -29,7 +30,7 @@ pscanf(const char *path, const char *fmt, ...)
int n; int n;
if (!(fp = fopen(path, "r"))) { if (!(fp = fopen(path, "r"))) {
fprintf(stderr, "fopen for %s failed", path); fprintf(stderr, "fopen '%s': %s\n", path, strerror(errno));
return -1; return -1;
} }
va_start(ap, fmt); va_start(ap, fmt);