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shell.c
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shell.c
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#include "user.h"
void main(void) {
while (1) {
prompt:
printf("> ");
char cmdline[128];
for (int i = 0;; i++) {
char ch = getchar();
putchar(ch);
if (i == sizeof(cmdline) - 1) {
printf("input too long\n");
goto prompt;
} else if (ch == '\r') {
printf("\n");
cmdline[i] = '\0';
break;
} else {
cmdline[i] = ch;
}
}
if (strcmp(cmdline, "hello") == 0) {
printf("Hello world from shell!!\n");
} else if (strcmp(cmdline, "exit") == 0) {
exit();
} else if (strcmp(cmdline, "readfile") == 0) {
char buf[128];
int len = readfile("hello.txt", buf, sizeof(buf));
buf[len] = '\0';
printf("%s\n", buf);
} else if (strcmp(cmdline, "writefile") == 0) {
writefile("hello.txt", "Hello from shell!\n", 19);
} else {
printf("unknown command: %s", cmdline);
}
}
}