init

fun.h

@@ -0,0 +1,12 @@
+#ifndef FUN_H_INCLUDED
+#define FUN_H_INCLUDED
+
+#define MAXLINE (80)
+
+void history(char *cmdline);
+void print_his(char *argv);
+
+void eval(char *cmdline);
+int parseline(const char *cmdline, char **argv);
+
+#endif // FUN_H_INCLUDED

fun_1.c

@@ -0,0 +1,129 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "fun.h"
+
+
+void eval(char *cmdline)
+{
+    char *argv[MAXLINE];
+    char buf[MAXLINE];
+    int isBg;
+    int pid;
+
+    strcpy(buf,cmdline);
+    isBg = parseline(cmdline,argv);
+
+    if(argv[0] == NULL)
+    {
+	    return;
+    }
+
+    if(!builtin_cmd(argv))
+    {
+/*
+        if((pid=fork())==0)
+        {
+            setpgid(0,0);
+            if(execvp(argv[0],argv)<0)
+            {
+                printf("%s:Command not found.\n",argv[0]);
+                exit(0);
+            }
+        }
+
+        if(!isBg)
+        {
+            waitfg(pid);
+        }
+        else
+        {
+            printf("[%d] (%d) %s",pid2jid(pid),pid,cmdline);
+        }
+*/
+    }
+    return;
+}
+
+int parseline(const char *cmdline, char **argv)
+{
+    static char array[MAXLINE];
+    char *buf = array;
+    char *delim;
+    int argc;
+    int bg;
+
+    strcpy(buf, cmdline);
+    buf[strlen(buf)-1] = ' ';
+    while (*buf && (*buf == ' '))
+        buf++;
+
+    argc = 0;
+    if (*buf == '\'')
+    {
+        buf++;
+        delim = strchr(buf, '\'');
+    }
+    else
+    {
+        delim = strchr(buf, ' ');
+    }
+
+    while (delim)
+    {
+        argv[argc++] = buf;
+        *delim = '\0';
+        buf = delim + 1;
+        while (*buf && (*buf == ' '))
+        {
+            buf++;
+        }
+
+        if (*buf == '\'')
+        {
+            buf++;
+            delim = strchr(buf, '\'');
+        }
+        else
+        {
+            delim = strchr(buf, ' ');
+        }
+    }
+    argv[argc] = NULL;
+
+    if (argc == 0)
+	return 1;
+
+    if ((bg = (*argv[argc-1] == '&')) != 0)
+    {
+        argv[--argc] = NULL;
+    }
+    return bg;
+}
+
+int builtin_cmd(char **argv)
+{
+	if(!strcmp(argv[0],"quit")||!strcmp(argv[0],"exit"))
+    {
+		exit(0);
+	}
+    if(!strcmp(argv[0],"history"))
+    {
+        print_his(argv[1]);
+		return 1;
+	}
+    if(!strcmp(argv[0],"jobs"))
+    {
+		return 1;
+	}
+    if(!strcmp(argv[0],"bg")||!strcmp(argv[0],"fg"))
+    {
+		return 1;
+	}
+	if(!strcmp(argv[0], "&"))
+	{
+		return 1;
+	}
+
+    return 0;
+}

fun_2.c

@@ -0,0 +1,23 @@
+#include <string.h>
+#include "fun.h"
+
+static int num = 0;
+static char storage[MAXLINE][MAXLINE];
+
+void history(char *cmdline)
+{
+    strcpy(storage[num], cmdline);
+    num++;
+}
+
+void print_his(char *argv)
+{
+
+    int i = num - atoi(argv);
+    if(i < 0)
+    {
+        i = 0;
+    }
+    for(; i<num; i++)
+        puts(storage[i]);
+}

main.c

@@ -0,0 +1,17 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include "fun.h"
+
+int main()
+{
+    char cmdline[MAXLINE];
+
+    while(1)
+    {
+        printf("COMMAND->");
+        fgets(cmdline, MAXLINE, stdin);
+        eval(cmdline);
+        history(cmdline);
+    }
+    return 0;
+}