summaryrefslogtreecommitdiff
path: root/tools/include/nolibc/stdio.h
blob: 16cd4d8072518b889ab97e7851a97dda740c7089 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
/*
 * minimal stdio function definitions for NOLIBC
 * Copyright (C) 2017-2021 Willy Tarreau <w@1wt.eu>
 */

#ifndef _NOLIBC_STDIO_H
#define _NOLIBC_STDIO_H

#include "std.h"
#include "arch.h"
#include "errno.h"
#include "types.h"
#include "sys.h"
#include "stdarg.h"
#include "stdlib.h"
#include "string.h"

#ifndef EOF
#define EOF (-1)
#endif

/* Buffering mode used by setvbuf.  */
#define _IOFBF 0	/* Fully buffered. */
#define _IOLBF 1	/* Line buffered. */
#define _IONBF 2	/* No buffering. */

/* just define FILE as a non-empty type. The value of the pointer gives
 * the FD: FILE=~fd for fd>=0 or NULL for fd<0. This way positive FILE
 * are immediately identified as abnormal entries (i.e. possible copies
 * of valid pointers to something else).
 */
typedef struct FILE {
	char dummy[1];
} FILE;

static __attribute__((unused)) FILE* const stdin  = (FILE*)(intptr_t)~STDIN_FILENO;
static __attribute__((unused)) FILE* const stdout = (FILE*)(intptr_t)~STDOUT_FILENO;
static __attribute__((unused)) FILE* const stderr = (FILE*)(intptr_t)~STDERR_FILENO;

/* provides a FILE* equivalent of fd. The mode is ignored. */
static __attribute__((unused))
FILE *fdopen(int fd, const char *mode __attribute__((unused)))
{
	if (fd < 0) {
		SET_ERRNO(EBADF);
		return NULL;
	}
	return (FILE*)(intptr_t)~fd;
}

/* provides the fd of stream. */
static __attribute__((unused))
int fileno(FILE *stream)
{
	intptr_t i = (intptr_t)stream;

	if (i >= 0) {
		SET_ERRNO(EBADF);
		return -1;
	}
	return ~i;
}

/* flush a stream. */
static __attribute__((unused))
int fflush(FILE *stream)
{
	intptr_t i = (intptr_t)stream;

	/* NULL is valid here. */
	if (i > 0) {
		SET_ERRNO(EBADF);
		return -1;
	}

	/* Don't do anything, nolibc does not support buffering. */
	return 0;
}

/* flush a stream. */
static __attribute__((unused))
int fclose(FILE *stream)
{
	intptr_t i = (intptr_t)stream;

	if (i >= 0) {
		SET_ERRNO(EBADF);
		return -1;
	}

	if (close(~i))
		return EOF;

	return 0;
}

/* getc(), fgetc(), getchar() */

#define getc(stream) fgetc(stream)

static __attribute__((unused))
int fgetc(FILE* stream)
{
	unsigned char ch;

	if (read(fileno(stream), &ch, 1) <= 0)
		return EOF;
	return ch;
}

static __attribute__((unused))
int getchar(void)
{
	return fgetc(stdin);
}


/* putc(), fputc(), putchar() */

#define putc(c, stream) fputc(c, stream)

static __attribute__((unused))
int fputc(int c, FILE* stream)
{
	unsigned char ch = c;

	if (write(fileno(stream), &ch, 1) <= 0)
		return EOF;
	return ch;
}

static __attribute__((unused))
int putchar(int c)
{
	return fputc(c, stdout);
}


/* fwrite(), puts(), fputs(). Note that puts() emits '\n' but not fputs(). */

/* internal fwrite()-like function which only takes a size and returns 0 on
 * success or EOF on error. It automatically retries on short writes.
 */
static __attribute__((unused))
int _fwrite(const void *buf, size_t size, FILE *stream)
{
	ssize_t ret;
	int fd = fileno(stream);

	while (size) {
		ret = write(fd, buf, size);
		if (ret <= 0)
			return EOF;
		size -= ret;
		buf += ret;
	}
	return 0;
}

static __attribute__((unused))
size_t fwrite(const void *s, size_t size, size_t nmemb, FILE *stream)
{
	size_t written;

	for (written = 0; written < nmemb; written++) {
		if (_fwrite(s, size, stream) != 0)
			break;
		s += size;
	}
	return written;
}

static __attribute__((unused))
int fputs(const char *s, FILE *stream)
{
	return _fwrite(s, strlen(s), stream);
}

static __attribute__((unused))
int puts(const char *s)
{
	if (fputs(s, stdout) == EOF)
		return EOF;
	return putchar('\n');
}


/* fgets() */
static __attribute__((unused))
char *fgets(char *s, int size, FILE *stream)
{
	int ofs;
	int c;

	for (ofs = 0; ofs + 1 < size;) {
		c = fgetc(stream);
		if (c == EOF)
			break;
		s[ofs++] = c;
		if (c == '\n')
			break;
	}
	if (ofs < size)
		s[ofs] = 0;
	return ofs ? s : NULL;
}


/* minimal vfprintf(). It supports the following formats:
 *  - %[l*]{d,u,c,x,p}
 *  - %s
 *  - unknown modifiers are ignored.
 */
static __attribute__((unused, format(printf, 2, 0)))
int vfprintf(FILE *stream, const char *fmt, va_list args)
{
	char escape, lpref, c;
	unsigned long long v;
	unsigned int written;
	size_t len, ofs;
	char tmpbuf[21];
	const char *outstr;

	written = ofs = escape = lpref = 0;
	while (1) {
		c = fmt[ofs++];

		if (escape) {
			/* we're in an escape sequence, ofs == 1 */
			escape = 0;
			if (c == 'c' || c == 'd' || c == 'u' || c == 'x' || c == 'p') {
				char *out = tmpbuf;

				if (c == 'p')
					v = va_arg(args, unsigned long);
				else if (lpref) {
					if (lpref > 1)
						v = va_arg(args, unsigned long long);
					else
						v = va_arg(args, unsigned long);
				} else
					v = va_arg(args, unsigned int);

				if (c == 'd') {
					/* sign-extend the value */
					if (lpref == 0)
						v = (long long)(int)v;
					else if (lpref == 1)
						v = (long long)(long)v;
				}

				switch (c) {
				case 'c':
					out[0] = v;
					out[1] = 0;
					break;
				case 'd':
					i64toa_r(v, out);
					break;
				case 'u':
					u64toa_r(v, out);
					break;
				case 'p':
					*(out++) = '0';
					*(out++) = 'x';
					/* fall through */
				default: /* 'x' and 'p' above */
					u64toh_r(v, out);
					break;
				}
				outstr = tmpbuf;
			}
			else if (c == 's') {
				outstr = va_arg(args, char *);
				if (!outstr)
					outstr="(null)";
			}
			else if (c == '%') {
				/* queue it verbatim */
				continue;
			}
			else {
				/* modifiers or final 0 */
				if (c == 'l') {
					/* long format prefix, maintain the escape */
					lpref++;
				}
				escape = 1;
				goto do_escape;
			}
			len = strlen(outstr);
			goto flush_str;
		}

		/* not an escape sequence */
		if (c == 0 || c == '%') {
			/* flush pending data on escape or end */
			escape = 1;
			lpref = 0;
			outstr = fmt;
			len = ofs - 1;
		flush_str:
			if (_fwrite(outstr, len, stream) != 0)
				break;

			written += len;
		do_escape:
			if (c == 0)
				break;
			fmt += ofs;
			ofs = 0;
			continue;
		}

		/* literal char, just queue it */
	}
	return written;
}

static __attribute__((unused, format(printf, 1, 0)))
int vprintf(const char *fmt, va_list args)
{
	return vfprintf(stdout, fmt, args);
}

static __attribute__((unused, format(printf, 2, 3)))
int fprintf(FILE *stream, const char *fmt, ...)
{
	va_list args;
	int ret;

	va_start(args, fmt);
	ret = vfprintf(stream, fmt, args);
	va_end(args);
	return ret;
}

static __attribute__((unused, format(printf, 1, 2)))
int printf(const char *fmt, ...)
{
	va_list args;
	int ret;

	va_start(args, fmt);
	ret = vfprintf(stdout, fmt, args);
	va_end(args);
	return ret;
}

static __attribute__((unused))
void perror(const char *msg)
{
	fprintf(stderr, "%s%serrno=%d\n", (msg && *msg) ? msg : "", (msg && *msg) ? ": " : "", errno);
}

static __attribute__((unused))
int setvbuf(FILE *stream __attribute__((unused)),
	    char *buf __attribute__((unused)),
	    int mode,
	    size_t size __attribute__((unused)))
{
	/*
	 * nolibc does not support buffering so this is a nop. Just check mode
	 * is valid as required by the spec.
	 */
	switch (mode) {
	case _IOFBF:
	case _IOLBF:
	case _IONBF:
		break;
	default:
		return EOF;
	}

	return 0;
}

/* make sure to include all global symbols */
#include "nolibc.h"

#endif /* _NOLIBC_STDIO_H */