process.c

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#include "process.h"

// app_printf
//     A version of console_printf that picks a sensible color by process ID.

void app_printf(int colorid, const char* format, ...) {
    int color;
    if (colorid < 0) {
        color = 0x0700;
    } else {
        static const uint8_t col[] = { 0x0E, 0x0F, 0x0C, 0x0A, 0x09 };
        color = col[colorid % sizeof(col)] << 8;
    }

    va_list val;
    va_start(val, format);
    cursorpos = console_vprintf(cursorpos, color, format, val);
    va_end(val);

    if (CROW(cursorpos) >= 23) {
        cursorpos = CPOS(0, 0);
    }
}


// panic, assert_fail
//     Call the INT_SYS_PANIC system call so the kernel loops until Control-C.

void panic(const char* format, ...) {
    va_list val;
    va_start(val, format);
    char buf[160];
    memcpy(buf, "PANIC: ", 7);
    int len = vsnprintf(&buf[7], sizeof(buf) - 7, format, val) + 7;
    va_end(val);
    if (len > 0 && buf[len - 1] != '\n') {
        strcpy(buf + len - (len == (int) sizeof(buf) - 1), "\n");
    }
    (void) console_printf(CPOS(23, 0), 0xC000, "%s", buf);
    sys_panic(NULL);
 spinloop: goto spinloop;       // should never get here
}

void assert_fail(const char* file, int line, const char* msg) {
    (void) console_printf(CPOS(23, 0), 0xC000,
                          "PANIC: %s:%d: assertion '%s' failed\n",
                          file, line, msg);
    sys_panic(NULL);
 spinloop: goto spinloop;       // should never get here
}