Allow execution of external commands

src/main.c

@@ -5,6 +5,9 @@
 #include <signal.h>
 #include <string.h>
 #include <limits.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/wait.h>
 
 #include "icmd.h"
 
@@ -20,6 +23,19 @@ char *g_tokens[TOKENS_NUM_MAX];
 char g_args[TOKENS_ARGS_SIZE];
 
 
+void
+print(char *format, ...)
+{
+	va_list args;
+
+	va_start(args, format);
+	printf("psh: ");
+	vprintf(format, args);
+	putchar('\n');
+	va_end(args);
+}
+
+
 void
 die(int status, char *format, ...)
 {
@@ -27,15 +43,18 @@ die(int status, char *format, ...)
 
         va_start(args, format);
         if (status != 0)
-                puts("Error: ");
+                puts("psh: error: ");
+
         vprintf(format, args);
         if (status != 0)
-                puts("! Exiting...");
+                puts("! exiting...");
+
         putchar('\n');
         if (status < 0)
-                perror("Reason");
-        exit(status);
+                perror("reason");
+
         va_end(args);
+	exit(status);
 }
 
 
@@ -79,6 +98,32 @@ tokenize(char *input)
         return argc;
 }
 
+int
+call_ecmd(int argc, char **argv)
+{
+	int status;
+	char *err;
+	pid_t pid;
+	
+	pid = fork();
+
+	if (pid == -1)
+		die(-1, "fork failed");
+
+	/* parent */
+	if (pid)
+		return wait(&status), status;
+
+	/* child */
+	execvp(argv[0], argv);
+
+	/* if we are here then called program failed */
+	err = strerror(errno);
+	print("%s: %s", argv[0], err);
+
+	return -1;
+}
+
 
 int
 main(int argc, char **argv)
@@ -94,7 +139,7 @@ main(int argc, char **argv)
         for (;;)
         {
                 if (getcwd(cwd, sizeof(cwd)) == NULL)
-                        die(-1, "Could not get current directory");
+                        die(1, "Could not get current directory");
 
                 printf("[%s] ", cwd);
 
@@ -102,12 +147,25 @@ main(int argc, char **argv)
                         die(0, "Caught ^D");
 
                 if ((num_tokens = tokenize(input)) < 0)
-                        die(1, "Could not parse tokens");
+                        die(1, "Could not parse input");
 
+		/* no input, start again */
                 if (num_tokens == 0)
                         continue;
 
-                if ((ret = call_icmd(num_tokens, g_tokens) < 0))
-                        puts("Internal command failed!");
+		/* search for internal commands first */
+		if ((ret = find_icmd(g_tokens[0])) >= 0)
+		{
+			ret = call_icmd(ret, num_tokens, g_tokens);
+
+			if (ret)
+				print("Internal command '%s' failed with error code: %d", g_tokens[0], ret);
+
+			continue;
+		}
+		
+		ret = call_ecmd(num_tokens, g_tokens);
+		if (ret)
+			print("External command '%s' failed with error code: %d", g_tokens[0], ret);
         }
 }