slstatus

My fork of https://tools.suckless.org/slstatus/
git clone https://git.inz.fi/slstatus
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commit 0aefd57f9f469aba25ffbe9bdda04e894b9d739a
parent 5829cee24ea0e40cbe402728d1ca2f0bfb630182
Author: Ali H. Fardan <raiz@firemail.cc>
Date:   Tue, 30 Aug 2016 21:50:40 +0300

got rid of conditional assignments && improved the error messages to output more info && added bound checks for fscanf() in hostname() (a dirty hack) && fixed a bug or two && some tiny style corrections

Diffstat:
Mslstatus.c | 155+++++++++++++++++++++++++++++++++++++++++++++++--------------------------------
1 file changed, 93 insertions(+), 62 deletions(-)

diff --git a/slstatus.c b/slstatus.c @@ -105,7 +105,7 @@ battery_perc(const char *battery) int now, full, perc; char batterynowfile[64]; char batteryfullfile[64]; - FILE *fp; + FILE *fp = fopen(batterynowfile, "r"); strlcpy(batterynowfile, BATTERY_PATH, sizeof(batterynowfile)); strlcat(batterynowfile, battery, sizeof(batterynowfile)); @@ -117,16 +117,20 @@ battery_perc(const char *battery) strlcat(batteryfullfile, "/", sizeof(batteryfullfile)); strlcat(batteryfullfile, BATTERY_FULL, sizeof(batteryfullfile)); - if (!(fp = fopen(batterynowfile, "r"))) { - fprintf(stderr, "Error opening battery file: %s.\n", batterynowfile); + if (fp == NULL ) { + fprintf(stderr, "Error opening battery file: %s: %s\n", + batterynowfile, + strerror(errno)); return smprintf(UNKNOWN_STR); } fscanf(fp, "%i", &now); fclose(fp); - if (!(fp = fopen(batteryfullfile, "r"))) { - fprintf(stderr, "Error opening battery file.\n"); + fp = fopen(batteryfullfile, "r"); + if (fp == NULL) { + fprintf(stderr, "Error opening battery file: %s\n", + strerror(errno)); return smprintf(UNKNOWN_STR); } @@ -143,10 +147,11 @@ cpu_perc(void) { int perc; long double a[4], b[4]; - FILE *fp; + FILE *fp = fopen("/proc/stat","r"); - if (!(fp = fopen("/proc/stat","r"))) { - fprintf(stderr, "Error opening stat file.\n"); + if (fp == NULL) { + fprintf(stderr, "Error opening stat file: %s\n", + strerror(errno)); return smprintf(UNKNOWN_STR); } @@ -156,8 +161,10 @@ cpu_perc(void) /* wait a second (for avg values) */ sleep(1); - if (!(fp = fopen("/proc/stat","r"))) { - fprintf(stderr, "Error opening stat file.\n"); + fp = fopen("/proc/stat","r"); + if (fp == NULL) { + fprintf(stderr, "Error opening stat file: %s\n", + strerror(errno)); return smprintf(UNKNOWN_STR); } @@ -186,7 +193,8 @@ disk_free(const char *mountpoint) struct statvfs fs; if (statvfs(mountpoint, &fs) < 0) { - fprintf(stderr, "Could not get filesystem info.\n"); + fprintf(stderr, "Could not get filesystem info: %s\n", + strerror(errno)); return smprintf(UNKNOWN_STR); } return smprintf("%f", (float)fs.f_bsize * (float)fs.f_bfree / 1024 / 1024 / 1024); @@ -199,7 +207,8 @@ disk_perc(const char *mountpoint) struct statvfs fs; if (statvfs(mountpoint, &fs) < 0) { - fprintf(stderr, "Could not get filesystem info.\n"); + fprintf(stderr, "Could not get filesystem info: %s\n", + strerror(errno)); return smprintf(UNKNOWN_STR); } @@ -213,7 +222,8 @@ disk_total(const char *mountpoint) struct statvfs fs; if (statvfs(mountpoint, &fs) < 0) { - fprintf(stderr, "Could not get filesystem info.\n"); + fprintf(stderr, "Could not get filesystem info: %s\n", + strerror(errno)); return smprintf(UNKNOWN_STR); } @@ -226,7 +236,8 @@ disk_used(const char *mountpoint) struct statvfs fs; if (statvfs(mountpoint, &fs) < 0) { - fprintf(stderr, "Could not get filesystem info.\n"); + fprintf(stderr, "Could not get filesystem info: %s\n", + strerror(errno)); return smprintf(UNKNOWN_STR); } @@ -237,9 +248,9 @@ static char * entropy(void) { int entropy = 0; - FILE *fp; + FILE *fp = fopen("/proc/sys/kernel/random/entropy_avail", "r"); - if (!(fp = fopen("/proc/sys/kernel/random/entropy_avail", "r"))) { + if (fp == NULL) { fprintf(stderr, "Could not open entropy file.\n"); return smprintf(UNKNOWN_STR); } @@ -260,14 +271,18 @@ static char * hostname(void) { char hostname[HOST_NAME_MAX]; - FILE *fp; + FILE *fp = fopen("/proc/sys/kernel/hostname", "r"); - if (!(fp = fopen("/proc/sys/kernel/hostname", "r"))) { - fprintf(stderr, "Could not open hostname file.\n"); + if (fp == NULL) { + fprintf(stderr, "Could not open hostname file: %s\n", + strerror(errno)); return smprintf(UNKNOWN_STR); } - fscanf(fp, "%s\n", hostname); + fgets(hostname, sizeof(hostname), fp); + /* FIXME: needs improvement */ + memset(&hostname[strlen(hostname)-1], '\0', + sizeof(hostname) - strlen(hostname)); fclose(fp); return smprintf("%s", hostname); } @@ -280,7 +295,8 @@ ip(const char *interface) char host[NI_MAXHOST]; if (getifaddrs(&ifaddr) == -1) { - fprintf(stderr, "Error getting IP address.\n"); + fprintf(stderr, "Error getting IP address: %s\n", + strerror(errno)); return smprintf(UNKNOWN_STR); } @@ -289,7 +305,8 @@ ip(const char *interface) if (ifa->ifa_addr == NULL) continue; - 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, interface) == 0) && (ifa->ifa_addr->sa_family == AF_INET)) { if (s != 0) { @@ -323,10 +340,11 @@ static char * ram_free(void) { long free; - FILE *fp; + FILE *fp = fopen("/proc/meminfo", "r"); - if (!(fp = fopen("/proc/meminfo", "r"))) { - fprintf(stderr, "Error opening meminfo file.\n"); + if (fp == NULL) { + fprintf(stderr, "Error opening meminfo file: %s\n", + strerror(errno)); return smprintf(UNKNOWN_STR); } @@ -340,10 +358,11 @@ ram_perc(void) { int perc; long total, free, buffers, cached; - FILE *fp; + FILE *fp = fopen("/proc/meminfo", "r"); - if (!(fp = fopen("/proc/meminfo", "r"))) { - fprintf(stderr, "Error opening meminfo file.\n"); + if (fp == NULL) { + fprintf(stderr, "Error opening meminfo file: %s\n", + strerror(errno)); return smprintf(UNKNOWN_STR); } @@ -361,10 +380,11 @@ static char * ram_total(void) { long total; - FILE *fp; + FILE *fp = fopen("/proc/meminfo", "r"); - if (!(fp = fopen("/proc/meminfo", "r"))) { - fprintf(stderr, "Error opening meminfo file.\n"); + if (fp == NULL) { + fprintf(stderr, "Error opening meminfo file: %s\n", + strerror(errno)); return smprintf(UNKNOWN_STR); } @@ -377,10 +397,11 @@ static char * ram_used(void) { long free, total, buffers, cached, used; - FILE *fp; + FILE *fp = fopen("/proc/meminfo", "r"); - if (!(fp = fopen("/proc/meminfo", "r"))) { - fprintf(stderr, "Error opening meminfo file.\n"); + if (fp == NULL) { + fprintf(stderr, "Error opening meminfo file: %s\n", + strerror(errno)); return smprintf(UNKNOWN_STR); } @@ -398,15 +419,16 @@ static char * run_command(const char* command) { int good; - FILE *fp; + FILE *fp = popen(command, "r"); char buffer[64]; - if (!(fp = popen(command, "r"))) { - fprintf(stderr, "Could not get command output for: %s.\n", command); + if (fp == NULL) { + fprintf(stderr, "Could not get command output for: %s: %s\n", + command, strerror(errno)); return smprintf(UNKNOWN_STR); } - fgets(buffer, sizeof(buffer) - 1, fp); + fgets(buffer, sizeof(buffer)-1, fp); pclose(fp); for (int i = 0 ; i != sizeof(buffer); i++) { if (buffer[i] == '\0') { @@ -415,7 +437,7 @@ run_command(const char* command) } } if (good) - buffer[strlen(buffer) - 1] = '\0'; + buffer[strlen(buffer)-1] = '\0'; return smprintf("%s", buffer); } @@ -423,10 +445,11 @@ static char * temp(const char *file) { int temperature; - FILE *fp; + FILE *fp = fopen(file, "r"); - if (!(fp = fopen(file, "r"))) { - fprintf(stderr, "Could not open temperature file.\n"); + if (fp == NULL) { + fprintf(stderr, "Could not open temperature file: %s\n", + strerror(errno)); return smprintf(UNKNOWN_STR); } @@ -461,7 +484,8 @@ username(void) if (pw) return smprintf("%s", pw->pw_name); else { - fprintf(stderr, "Could not get username.\n"); + fprintf(stderr, "Could not get username: %s\n", + strerror(errno)); return smprintf(UNKNOWN_STR); } @@ -471,6 +495,7 @@ username(void) static char * uid(void) { + /* FIXME: WHY USE register modifier? */ register uid_t uid; uid = geteuid(); @@ -531,22 +556,21 @@ vol_perc(const char *soundcard) static char * wifi_perc(const char *wificard) { - int bufsize = 255; int strength; - char buf[bufsize]; + char buf[255]; char *datastart; char path[64]; char status[5]; - char needle[sizeof wificard + 1]; - FILE *fp; + char needle[strlen(wificard)+2]; + FILE *fp = fopen(path, "r"); - memset(path, 0, sizeof path); - strlcat(path, "/sys/class/net/", sizeof(path)); + strlcpy(path, "/sys/class/net/", sizeof(path)); strlcat(path, wificard, sizeof(path)); strlcat(path, "/operstate", sizeof(path)); - if(!(fp = fopen(path, "r"))) { - fprintf(stderr, "Error opening wifi operstate file.\n"); + if(fp == NULL) { + fprintf(stderr, "Error opening wifi operstate file: %s\n", + strerror(errno)); return smprintf(UNKNOWN_STR); } @@ -555,17 +579,21 @@ wifi_perc(const char *wificard) if(strcmp(status, "up\n") != 0) return smprintf(UNKNOWN_STR); - if (!(fp = fopen("/proc/net/wireless", "r"))) { - fprintf(stderr, "Error opening wireless file.\n"); + fp = fopen("/proc/net/wireless", "r"); + if (fp == NULL) { + fprintf(stderr, "Error opening wireless file: %s\n", + strerror(errno)); return smprintf(UNKNOWN_STR); } strlcpy(needle, wificard, sizeof(needle)); strlcat(needle, ":", sizeof(needle)); - fgets(buf, bufsize, fp); - fgets(buf, bufsize, fp); - fgets(buf, bufsize, fp); - if ((datastart = strstr(buf, needle)) != NULL) { + fgets(buf, sizeof(buf), fp); + fgets(buf, sizeof(buf), fp); + fgets(buf, sizeof(buf), fp); + + datastart = strstr(buf, needle); + if (datastart != NULL) { datastart = strstr(buf, ":"); sscanf(datastart + 1, " %*d %d %*d %*d %*d %*d %*d %*d %*d %*d", &strength); } @@ -578,19 +606,21 @@ static char * wifi_essid(const char *wificard) { char id[IW_ESSID_MAX_SIZE+1]; - int sockfd; + int sockfd = socket(AF_INET, SOCK_DGRAM, 0); struct iwreq wreq; memset(&wreq, 0, sizeof(struct iwreq)); wreq.u.essid.length = IW_ESSID_MAX_SIZE+1; sprintf(wreq.ifr_name, wificard); - if((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) { - fprintf(stderr, "Cannot open socket for interface: %s\n", wificard); + if(sockfd == -1) { + fprintf(stderr, "Cannot open socket for interface: %s: %s\n", + wificard, strerror(errno)); return smprintf(UNKNOWN_STR); } wreq.u.essid.pointer = id; if (ioctl(sockfd,SIOCGIWESSID, &wreq) == -1) { - fprintf(stderr, "Get ESSID ioctl failed for interface %s\n", wificard); + fprintf(stderr, "Get ESSID ioctl failed for interface %s: %s\n", + wificard, strerror(errno)); return smprintf(UNKNOWN_STR); } @@ -608,7 +638,8 @@ main(void) char *res, *element; struct arg argument; - if (!(dpy = XOpenDisplay(0x0))) { + dpy = XOpenDisplay(0x0); + if (!dpy) { fprintf(stderr, "Cannot open display!\n"); exit(1); }