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383 lines
11 KiB
C
383 lines
11 KiB
C
//----------------------------------------------------------------------------//
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// GNU GPL OS/K //
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// //
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// Desc: Buffer library //
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// //
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// //
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// Copyright © 2018-2019 The OS/K Team //
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// //
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// This file is part of OS/K. //
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// //
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// OS/K is free software: you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation, either version 3 of the License, or //
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// any later version. //
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// //
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// OS/K is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY//without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with OS/K. If not, see <https://www.gnu.org/licenses/>. //
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//----------------------------------------------------------------------------//
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#include <extras/buf.h>
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#include <extras/locks.h>
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error_t bputc(Buffer_t *buf, uchar ch);
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error_t vbprintf(Buffer_t *buf, const char *fmt, va_list ap);
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//
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// Prints formatted string on buf according to fmt
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//
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error_t BPrintOnBuf(Buffer_t *buf, const char *fmt, ...)
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{
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error_t rc;
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va_list ap;
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va_start(ap, fmt);
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ExAcquireLock(&buf->lock);
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rc = vbprintf(buf, fmt, ap);
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ExReleaseLock(&buf->lock);
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va_end(ap);
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return rc;
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}
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error_t BPrintOnBufV(Buffer_t *buf, const char *fmt, va_list ap)
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{
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error_t rc;
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ExAcquireLock(&buf->lock);
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rc = vbprintf(buf, fmt, ap);
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ExReleaseLock(&buf->lock);
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return rc;
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}
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//
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// Prints 0 for octal, 0x for hexadecimal, 0b for binary
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//
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static error_t bprinthash(Buffer_t *buf, int base, int cap)
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{
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error_t rc;
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if (base != 2 && base != 8 && base != 16) {
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return EOK;
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}
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rc = bputc(buf, '0');
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if (!rc && base != 8) {
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rc = bputc(buf, (base==2 ? 'b' : (cap ? 'X' : 'x')));
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}
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return rc;
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}
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static error_t bdopadding(Buffer_t *buf, size_t width, size_t len,
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char filler)
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{
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error_t rc = EOK;
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for (; !rc && width > len ; width--) {
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rc = bputc(buf, filler);
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}
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return rc;
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}
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#define CONVBUFSIZE 100
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//
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// Actually does BPrintOnBuf's job; doesn't lock anything
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// Quite a long function
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//
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error_t vbprintf(Buffer_t *buf, const char *fmt, va_list ap)
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{
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error_t rc = 0;
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int width, prec, len;
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char type;
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uchar uch;
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char *s;
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// Conversion buffer
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char convbuf[CONVBUFSIZE];
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// Flags
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int plus, minus, space, zero, hash;
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// Length modifiers
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int l, h, hh;
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// Signed
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bool sgn;
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// Capital digits
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bool cap;
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// Base
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int base;
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assert(buf && buf->initDone == INITOK);
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if (!buf || !fmt) return EINVAL;
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if (buf->state != BS_RDWR && buf->state != BS_WRONLY) {
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return EBADF;
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}
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// Progress in format string
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while (*fmt && !rc) {
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// Deal with all non-'%' characters
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if (*fmt != '%') {
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rc = bputc(buf, *fmt);
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fmt++;
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continue;
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}
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//
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// %[parameter][flags][width|*][.precision|*][length]type
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// We aren't dealing with parameters and floating stuff just yet
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//
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// Skip the '%'
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fmt++;
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// "%%" modifier
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if (*fmt == '%') {
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rc = bputc(buf, '%');
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fmt++;
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continue;
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}
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// Reset everything
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cap = sgn = 0;
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l = h = hh = 0;
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width = prec = 0;
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plus = minus = space = zero = hash = 0;
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//
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// Flags field
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//
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while (*fmt) {
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if (*fmt == '#') { fmt++; hash++; }
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else if (*fmt == '0') { fmt++; zero++; }
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else if (*fmt == '+') { fmt++; plus++; }
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else if (*fmt == '-') { fmt++; minus++; }
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else if (*fmt == ' ') { fmt++; space++; }
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// Next field
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else break;
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}
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//
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// Width & precision fields
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// A width field of zero is ignored
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//
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// Extracts either width or precision
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#define bextractwp(name) \
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do { \
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if (*fmt == '*') { \
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fmt++; \
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name = va_arg(ap, int); \
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} else { \
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while (isdigit(*fmt) && name < CONVBUFSIZE) { \
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name = 10 * name + (*fmt - '0'); \
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fmt++; \
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} \
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} \
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} while (0)
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// Extract width
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bextractwp(width);
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// A width below 0 activates the "minus" flag
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if (width < 0) {
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width = -width;
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minus++;
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}
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// Extract precision
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if (*fmt == '.') {
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fmt++;
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bextractwp(prec);
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}
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// Make sure they're not too big
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if (width > CONVBUFSIZE || prec > CONVBUFSIZE) {
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rc = EINVAL;
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break;
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}
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//
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// Length field
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//
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while (*fmt) {
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if (*fmt == 'l' || *fmt == 'z' || *fmt == 't') {
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fmt++;
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l++;
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}
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else if (*fmt == 'h') {
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fmt++;
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h++;
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}
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// Next field
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else break;
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}
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// Consistency check
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assert(!(l > 0 && h > 0));
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assert(!(l > 2 || h > 1));
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//
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// The type field
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//
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type = *fmt++;
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// Characters
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if (type == 'c') {
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uch = (uchar)va_arg(ap, int);
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bputc(buf, uch);
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continue;
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}
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// Strings
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else if (type == 's') {
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s = va_arg(ap, char *);
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if (s == NULL) s = "(null)";
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// For strings, the precision field gives the maximum
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// amount of characters to be read from the stream
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// Zero/nonspecified precision means unlimited amount
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if (prec == 0) prec = INT_MAX;
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for (; *s && prec-- ; s++) {
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rc = bputc(buf, (uchar)*s);
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}
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continue;
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}
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// Decimal, unsigned decimal, hexadecimal, octal and binary numbers
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else if (type == 'd' || type == 'i') { base = 10; sgn = 1; }
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else if (type == 'X') { base = 16; cap = 1; }
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else if (type == 'x') { base = 16; }
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else if (type == 'u') { base = 10; }
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else if (type == 'o') { base = 8; }
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else if (type == 'b') { base = 2; }
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// Pointers: %p = %#012lx
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// (48-bit pointers have width 12 at least)
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else if (type == 'p') {
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type = 'x'; base = 16; zero++; hash++; l++;
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if (width < 12) width = 12;
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}
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// Unknown/unsupported modifier
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// Note: a '\0' after length field falls here
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else {
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rc = EINVAL;
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break;
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}
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//
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// Numerical conversions
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//
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// We use s to iterate convbuf
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s = convbuf;
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// FIXME: this works, but is ugly as hell
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#define bdoconvrt(pref, type, vtype) \
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do { \
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type i_##type = (type)va_arg(ap, vtype); \
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pref##toa(i_##type, s, base); \
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} while (0)
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if (!l) {
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if (sgn) {
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if (h == 0) bdoconvrt(i, int, int);
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if (h == 1) bdoconvrt(i, short, int);
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} else {
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if (h == 0) bdoconvrt(u, uint, uint);
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if (h == 1) bdoconvrt(u, ushort, uint);
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}
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}
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else {
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if (sgn) bdoconvrt(l, long, long);
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else bdoconvrt(ul, ulong, ulong);
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}
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//
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// Implement flags and %X, and prints
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//
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// Capital letter digits
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if (base > 10 && cap) {
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for (; *s ; s++)
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if (islower(*s)) *s = toupper(*s);
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// We use this "opportunity" to compute the length of s
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len = s - convbuf;
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// Reset s
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s = convbuf;
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}
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// Compute s's length
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// It will always fit in an int
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else len = (int)strlen(s);
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// Adjust width
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if (sgn && (plus || space)) width--;
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else if (hash) width -= (base==8 ? 1 : ((base==2||base==16) ? 2 : 0));
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// When padding with spaces, we pad before +/-'s etc
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if (!minus && !zero && width > len)
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bdopadding(buf, width, len, ' ');
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// Deal with signs and the hash flag
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if (*s == '-') { rc = bputc(buf, '-'); s++, len--; }
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else if (sgn && plus) rc = bputc(buf, '+');
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else if (sgn && space) rc = bputc(buf, ' ');
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else if (hash) bprinthash(buf, base, cap);
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// Deal with padding by zeroes
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// The 'minus' flag makes no sense with the 'zero' one
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if (zero && width > len)
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bdopadding(buf, width, len, '0');
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//
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// Output the actual number
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//
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for (; !rc && *s ; s++) {
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rc = bputc(buf, (uchar)*s);
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}
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// 'minus' padding, only with spaces
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if (minus && !zero && width > len)
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bdopadding(buf, width, base, ' ');
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// Carry on to next modifier
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}
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// Assert rc for debugging purposes
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assert(!rc);
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return rc;
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}
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