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#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#ifdef MSWIN
# include <windows.h>
# define usleep(usecs) Sleep((usecs) / 1000)
#else
# include <stdlib.h>
# include <termios.h>
# include <unistd.h>
#endif
static void flush_wait(void)
{
fflush(NULL);
usleep(10 * 1000); // Wait 10 ms.
}
static void help(void)
{
puts("Fake shell");
puts("");
puts("Usage:");
puts(" shell-test --help");
puts(" Prints this help to stdout.");
puts(" shell-test");
puts(" shell-test EXE");
puts(" Prints \"ready $ \" to stderr.");
puts(" shell-test -t {prompt text}");
puts(" Prints \"{prompt text} $ \" to stderr.");
puts(" shell-test EXE \"prog args...\"");
puts(" Prints \"ready $ prog args...\\n\" to stderr.");
puts(" shell-test -t {prompt text} EXE \"prog args...\"");
puts(" Prints \"{prompt text} $ progs args...\" to stderr.");
puts(" shell-test EXECVP \"prog\" \"arg0\" args...");
puts(" Executes prog arg0 args... using execvp().");
puts(" shell-test REP N {text}");
puts(" Prints \"{lnr}: {text}\\n\" to stdout N times, pausing every 100 lines.");
puts(" Example:");
puts(" shell-test REP 97 \"foo bar\"");
puts(" 0: foo bar");
puts(" ...");
puts(" 96: foo bar");
puts(" shell-test REPFAST N {text}");
puts(" Like REP, but print as fast as possible and then exit immediately.");
puts(" shell-test INTERACT");
puts(" Prints \"interact $ \" to stderr, and waits for \"exit\" input.");
puts(" shell-test EXIT {code}");
puts(" Exits immediately with exit code \"{code}\".");
}
#ifndef MSWIN
static void drain_tty(void) {
// Sometimes the final output to TTY can be lost (at least on FreeBSD).
// Call tcdrain() to ensure all output has been transmitted to host terminal.
tcdrain(STDOUT_FILENO);
tcdrain(STDERR_FILENO);
}
#endif
int main(int argc, char **argv)
{
#ifdef MSWIN
SetConsoleOutputCP(CP_UTF8);
#else
atexit(drain_tty);
#endif
if (argc == 2 && strcmp(argv[1], "--help") == 0) {
help();
}
if (argc >= 2) {
if (strcmp(argv[1], "-t") == 0) {
if (argc < 3) {
fprintf(stderr, "Missing prompt text for -t option\n");
return 5;
} else {
fprintf(stderr, "%s $ ", argv[2]);
if (argc >= 5 && (strcmp(argv[3], "EXE") == 0)) {
fprintf(stderr, "%s\n", argv[4]);
}
}
} else if (strcmp(argv[1], "EXE") == 0) {
if (argc >= 3) {
fprintf(stderr, "ready $ %s\n", argv[2]);
} else {
fprintf(stderr, "ready $ ");
}
#ifndef MSWIN
} else if (strcmp(argv[1], "EXECVP") == 0) {
if (argc < 4) {
fprintf(stderr, "Not enough arguments for EXECVP\n");
return 6;
}
execvp(argv[2], argv + 3);
#endif
} else if (strcmp(argv[1], "REP") == 0 || strcmp(argv[1], "REPFAST") == 0) {
bool fast = strcmp(argv[1], "REPFAST") == 0;
if (argc != 4) {
fprintf(stderr, "REP/REPFAST expects exactly 3 arguments\n");
return 4;
}
int count = 0;
if (sscanf(argv[2], "%d", &count) != 1) {
fprintf(stderr, "Invalid count: %s\n", argv[2]);
return 4;
}
for (int i = 0; i < count; i++) {
printf("%d: %s\n", i, argv[3]);
if (!fast && i % 100 == 0) {
usleep(1000); // Wait 1 ms (simulate typical output).
}
fflush(NULL);
}
} else if (strcmp(argv[1], "UTF-8") == 0) {
// test split-up UTF-8 sequence
printf("\xc3"); flush_wait();
printf("\xa5\n"); flush_wait();
// split up a 2+2 grapheme clusters all possible ways
printf("ref: \xc3\xa5\xcc\xb2\n"); flush_wait();
printf("1: \xc3"); flush_wait();
printf("\xa5\xcc\xb2\n"); flush_wait();
printf("2: \xc3\xa5"); flush_wait();
printf("\xcc\xb2\n"); flush_wait();
printf("3: \xc3\xa5\xcc"); flush_wait();
printf("\xb2\n"); flush_wait();
} else if (strcmp(argv[1], "INTERACT") == 0) {
char input[256];
char cmd[100];
int arg;
while (true) {
fprintf(stderr, "interact $ ");
if (fgets(input, sizeof(input), stdin) == NULL) {
break; // EOF
}
if (1 == sscanf(input, "%99s %d", cmd, &arg)) {
arg = 0;
}
if (strcmp(cmd, "exit") == 0) {
return arg;
} else {
fprintf(stderr, "command not found: %s\n", cmd);
}
}
} else if (strcmp(argv[1], "EXIT") == 0) {
int code = 1;
if (argc >= 3) {
if (sscanf(argv[2], "%d", &code) != 1) {
fprintf(stderr, "Invalid exit code: %s\n", argv[2]);
return 2;
}
}
return code;
} else {
fprintf(stderr, "Unknown first argument: %s\n", argv[1]);
return 3;
}
fflush(NULL);
return 0;
} else if (argc == 1) {
fprintf(stderr, "ready $ ");
return 0;
} else {
fprintf(stderr, "Missing first argument\n");
return 2;
}
}
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