我想创建一个命令行解释器,每行有多个comamnd。
我将从keybord命令输入,例如:pwd ; ls ; cat file ; ls -l
我写了这个,有人可以帮我警告吗?
警告:
ex.c: In function ‘Execute’:
ex.c:33:18: warning: passing argument 1 of ‘execvp’ from incompatible pointer type [-Wincompatible-pointer-types]
if(execvp(cmd, pin) == -1) {
In file included from ex.c:3:0:
/usr/include/unistd.h:581:12: note: expected ‘const char *’ but argument is of type ‘char **’
extern int execvp (const char *__file, char *const __argv[])
ex.c: In function ‘main’:
ex.c:105:17: warning: passing argument 1 of ‘Execute’ from incompatible pointer type [-Wincompatible-pointer-types]
Execute(pin[0],pin);
ex.c:21:6: note: expected ‘char **’ but argument is of type ‘char *’
void Execute(char* cmd[],char* pin[]) {
^~~~~~~
抱歉英文不好。
#include <sys/wait.h>
#include <sys/types.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#define MAX_SIZE 512
//Clean function
void Clean(char* cmd[],char* pin[]) { //Clean Array
int a;
for(a=0; a < 40; a++){
cmd[a] = NULL;
pin[a] = NULL;
}
}
//execute commands
void Execute(char* cmd[],char* pin[]) {
pid_t pid;
pid = fork();
switch(pid) {
case -1:
printf("DEBUG:Fork Failure\n");
exit(-1);
case 0:
execvp(*cmd, pin);
if(execvp(cmd, pin) == -1) {
printf("Command Not Found\n");
exit(0);
}
default:
wait(NULL);
printf("DEBUG:Child Finished\n");
}
}
int main() {
char* cnd;
char* cmd[40];
char* pin[40];
char* array;
int how_much;
char *input = malloc (MAX_SIZE);
if (input == NULL) {
printf ("No memory\n");
return 1;
}
Clean(cmd,pin);
printf("shell> ");
fgets (input, MAX_SIZE, stdin);
if ((strlen(input)>0) && (input[strlen (input) - 1] == '\n')) {
input[strlen (input) - 1] = '\0';
}
printf("INPUT: %s\n", input);
//searching for ";"
cnd = strtok(input, ";");
int i = 0;
while(cnd != NULL) {
cmd[i] = cnd;
i++;
cnd = strtok(NULL, ";");
}
cmd[i] = NULL;
how_much = i;
// searching for " "
for(int j=0; j < how_much; j++) {
array = strtok(input, " ");
int k=0;
while(array != NULL) {
pin[k] = array;
k++;
array = strtok(NULL, " ");
}
pin[k] = NULL;
Execute(pin[0],pin);
}
free (input);
return 1;
}
答案 0 :(得分:0)
在Execute
函数中:
...
case 0:
execvp(*cmd, pin);
if (execvp(cmd, pin) == -1) {
...
您首先execvp(*cmd, pin)
然后execvp(cmd, pin)
。
这是否应该表明你出了什么问题。
在这里:
Execute(pin[0],pin);
在第一个参数中Execute
需要char*
的数组,但您提供的是char*
。
可能存在更多问题。