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提交 44e6909a 创建 作者: kaashoek's avatar kaashoek
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more simplifying

上级 e00baa9f
隐藏空白字符变更
内嵌 并排
正在显示 包含 12 行增加 和 15 行删除
sh.c
浏览文件 @ 44e6909a
......@@ -6,7 +6,7 @@
#define BUFSIZ 512
#define MAXARGS 10
#define MAXNODE 2
#define MAXIO 2
#define MAXCMD 2
// an embarrassingly naive shell
......@@ -22,7 +22,7 @@ struct cmd {
char argv0buf[BUFSIZ];
int argc;
int token;
struct ionode iolist[MAXNODE];
struct ionode iolist[MAXIO];
struct ionode *io;
};
struct cmd cmdlist[MAXCMD];
......@@ -75,30 +75,28 @@ parse(char *s)
cmd->argv[cmd->argc++] = t;
break;
case '<': // Input redirection
case '>': // Input and output redirection
case '<':
// Grab the filename from the argument list
if(gettoken(0, &t) != 'w') {
printf(2, "syntax error: < not followed by word\n");
printf(2, "syntax error: > not followed by word\n");
return -1;
}
cmd->io->token = '<';
cmd->io->s = t;
cmd->io++;
break;
case '>': // Output redirection
// Grab the filename from the argument list
if(gettoken(0, &t) != 'w') {
printf(2, "syntax error: > not followed by word\n");
if(cmd->io - cmd->iolist >= MAXIO) {
printf(2, "too many redirections\n");
return -1;
}
cmd->io->token = '>';
cmd->io->token = c;
cmd->io->s = t;
cmd->io++;
break;
case ';': // command sequence
case '|': // pipe
if(cmd->io - cmd->iolist >= MAXIO) {
printf(2, "too many redirections\n");
return -1;
}
cmd->token = c;
cmd++;
break;
......@@ -114,7 +112,6 @@ parse(char *s)
}
}
void
runcmd(void)
{
......
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