`uname`: add uname

Makefile

@@ -15,7 +15,7 @@ endif
 CC_FLAGS := ${CC_FLAGS} -I/opt/webos-sdk-x86_64/1.0.g/sysroots/armv7a-neon-webos-linux-gnueabi/usr/include --sysroot=/opt/webos-sdk-x86_64/1.0.g/sysroots/armv7a-neon-webos-linux-gnueabi
 endif
 ifndef PROGS
-PROGS := whoami arch ls pwd basename
+PROGS := whoami arch ls pwd basename uname
 endif
 make:
 	mkdir -p bin

src/uname.c

@@ -0,0 +1,110 @@
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <limits.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <sys/utsname.h>
+
+
+#include "version.h"
+
+/*
+whoami - prints the working user's username (unless --uid is specified)
+Available arguments:
+	--help: show this help message
+	--version: show the version of the program (WIP)
+	--uid: print the users numeric UID, instead of username
+*/
+
+//https://stackoverflow.com/questions/4770985/how-to-check-if-a-string-starts-with-another-string-in-c/4770992#4770992
+bool startsWithChar(const char *pre, const char str) {
+	char *e;
+	int index;
+	e = strchr(pre, str);
+	index = (int)(e - pre);
+	return index == 0;
+}
+
+int main(int argc, char** argv) {
+    struct utsname uts;
+    uname(&uts);
+	if (argc == 1) {
+		printf("supply missing operand.");
+		return 1;
+	} else {
+		for (int i = 1; i < argc; i++) {
+			char *arg = malloc(sizeof(argv[i]));
+			arg = argv[i];
+			/*printf(arg);
+			printf(" ");*/
+			if (!strcmp(arg, "--help")) {
+				char* help = 
+					"Drake's Epic Coreutils (working title) "
+					DRAKECU_VERSION
+					"\n"
+					"uname - prints system information.\n"
+					"Available arguments:\n"
+					"	--help: show this help message\n"
+					"	--version: show the version of the program\n"
+					"	-s, --sysinfo: kernel type(?)\n"
+					"	-h, --hostname: hostname\n"
+					"	-r, --krelease: kernel version\n"
+					"	-v, --kversion: verbose kernel build version info\n"
+					"	-m, --arch: cpu architecture\n"
+					"Examples:\n"
+					"	Command:\n"	
+					"		uname -srh\n"
+					"	Example output (on my system):\n"
+					"		Linux 5.12.14_1 ruthenic-void";
+				printf("%s\n", help);
+				return 0;
+			} else if (!strcmp(arg, "--version")) {
+				printf(DRAKECU_VERSION);
+				return 0;
+			} else if (!strcmp(arg, "--hostname")) {
+				char hostname[HOST_NAME_MAX + 1];
+				gethostname(hostname, HOST_NAME_MAX + 1);
+				printf(hostname);
+				printf(" ");
+			} else if (!strcmp(arg, "--sysinfo")) {
+				printf(uts.sysname);
+				printf(" ");
+			} else if (!strcmp(arg, "--krelease")) {
+				printf(uts.release);
+				printf(" ");
+			} else if (!strcmp(arg, "--kversion")) {
+				printf(uts.version);
+				printf(" ");
+			} else if (!strcmp(arg, "--arch")) {
+				printf(uts.machine);
+				printf(" ");
+			} else if (startsWithChar(arg, '-')) {
+				char info;
+				for (int n = 1; n < strlen(arg); n++) {
+					info = arg[n];
+					//printf(info);
+					//printf("\n");
+					if (info == 'h') {
+						char hostname[HOST_NAME_MAX + 1];
+						gethostname(hostname, HOST_NAME_MAX + 1);
+						printf(hostname);
+					}
+					if (info == 's') {
+						printf(uts.sysname);
+					}
+					if (info == 'r') {
+						printf(uts.release);
+					}
+					if (info == 'v') {
+						printf(uts.version);
+					}
+					if (info == 'm') {
+						printf(uts.machine);
+					}
+					printf(" ");
+				}
+			}
+		}
+	}
+}