kaguya
2fa39ad85a
Self explanatory, we finally have a working ish shell Now we need to do some more stuff or something, probably work on a fork or something Signed-off-by: kaguya <vpshinomiya@protonmail.com> Co-authored-by: Copilot <copilot@github.com>
129 lines
3.2 KiB
C
129 lines
3.2 KiB
C
#include "../include/syscalls.h"
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#define STDIN 0
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#define STDOUT 1
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unsigned strlen(const char* str)
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{
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unsigned len = 0;
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while (*str)
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{
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++len;
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++str;
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}
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return len;
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}
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static int strcmp(const char* a, const char* b)
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{
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while (*a && (*a == *b)) {
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a++;
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b++;
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}
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return *(unsigned char*)a - *(unsigned char*)b;
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}
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static void print(const char* s)
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{
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syscall(SYS_WRITE, STDOUT, (unsigned long)s, strlen(s), 0, 0, 0);
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}
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static void readline(char* buf, unsigned long max)
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{
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unsigned long i = 0;
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while (i < max - 1)
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{
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char c;
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long n = syscall(SYS_READ, STDIN, (unsigned long)&c, 1, 0, 0, 0);
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if (n <= 0)
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continue;
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if (c == '\n')
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break;
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if (c == '\b') {
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if (i > 0) i--;
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continue;
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}
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buf[i++] = c;
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}
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buf[i] = '\0';
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}
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static void cat(const char* path)
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{
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unsigned char buf[256];
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long fd = syscall(SYS_OPEN, (unsigned long)path, 0, 0, 0, 0, 0);
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if (fd < 0) {
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print("cat: cannot open file\n");
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return;
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}
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long n = syscall(SYS_READ, fd, (unsigned long)buf, sizeof(buf), 0, 0, 0);
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syscall(SYS_CLOSE, fd, 0, 0, 0, 0, 0);
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if (n > 0)
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syscall(SYS_WRITE, STDOUT, (unsigned long)buf, n, 0, 0, 0);
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}
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void main()
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{
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const unsigned char* path = "/qwerty.txt";
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const unsigned char* msg = "Suki Suki Daisuki Kekkon Shiyo, my honey!";
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unsigned char buf[128];
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// ── open file ─────────────────────────────
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unsigned long fd = syscall(SYS_OPEN, (long)path, 0, 0, 0, 0, 0);
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// ── write message ─────────────────────────
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syscall(SYS_WRITE, fd, (long)msg, strlen(msg), 0, 0, 0);
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// ── close ────────────────────────────────
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syscall(SYS_CLOSE, fd, 0, 0, 0, 0, 0);
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// ── reopen ───────────────────────────────
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fd = syscall(SYS_OPEN, (long)path, 0, 0, 0, 0, 0);
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// ── read into buffer ─────────────────────
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unsigned long n = syscall(SYS_READ, fd, (unsigned long)buf, sizeof(buf), 0, 0, 0);
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// ── close ────────────────────────────────
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syscall(SYS_CLOSE, fd, 0, 0, 0, 0, 0);
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// ── print buffer to stdout ───────────────
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syscall(SYS_WRITE, STDOUT, (unsigned long)buf, n, 0, 0, 0);
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char line[128];
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while (1)
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{
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print("> ");
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readline(line, sizeof(line));
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if (strcmp(line, "exit") == 0)
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break;
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// simple "cat <path>"
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if (line[0] == 'c' && line[1] == 'a' && line[2] == 't' && line[3] == ' ')
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{
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cat(&line[4]);
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continue;
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}
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if (line[0] != '\0')
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print("Unknown command\n");
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}
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while (1);
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// ── done ────────────────────────────────
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while (1);
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} |