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*: initial commit kinda dumb, but wifi was out and I was bored. most of this code is shit.
author Paper <paper@tflc.us>
date Wed, 03 Dec 2025 03:04:39 -0500
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1 /**
2 * "Portable" printf implementation, with some extras.
3 *
4 * Copyright (c) Paper 2025
5 *
6 * Permission to use, copy, modify, and/or distribute this software for any
7 * purpose with or without fee is hereby granted.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
10 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
11 * AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
12 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
13 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
14 * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
15 * PERFORMANCE OF THIS SOFTWARE.
16 *
17 * NOTE: Floating point support is very scuffed, and doesn't
18 * work for many numbers. It also depends on math.h. If you don't
19 * care or don't want floating point support, toggle the #define
20 * to disable it.
21 *
22 * EXTRA NOTE: You don't need malloc() if you turn off wide character
23 * support :)
24 **/
25
26 #ifndef MY_PRINTF_H_
27 #define MY_PRINTF_H_
28
29 #include <stdarg.h>
30 #include <stddef.h>
31 #include <stdio.h>
32 #include <limits.h>
33
34 /* XXX maybe we shouldn't use int as a return type. */
35
36 enum {
37 MY_ENOMEM = -1, /* Out of memory */
38 MY_EINVAL = -2, /* Invalid format string */
39 MY_EENCOD = -3, /* Invalid wide character */
40 MY_EOVERFLOW = -4, /* Return value overflows */
41 };
42
43 /* Get string representation of error */
44 const char *my_strerror(int err);
45
46 /* Free dynamically allocated memory */
47 void my_free(void *x);
48
49 /* ------ Actual printf stuff */
50
51 /* put function spec */
52 typedef void (*put_spec)(void *opaque, unsigned char c);
53
54 /* iprintf: my invention. it's basically the function that actually
55 * implements everything :) */
56 int my_viprintf(put_spec put, void *opaque, const char *format, va_list ap);
57 int my_iprintf(put_spec put, void *opaque, const char *format, ...);
58
59 /* Equivalent to C99 [v]snprintf */
60 int my_vsnprintf(char *s, size_t n, const char *format, va_list ap);
61 int my_snprintf(char *s, size_t n, const char *format, ...);
62
63 /* Puts an allocated printf'd string into '*ps'. Use my_free to deallocate. */
64 int my_vasprintf(char **ps, const char *format, va_list ap);
65 int my_asprintf(char **ps, const char *format, ...);
66
67 int my_vfprintf(FILE *f, const char *fmt, va_list ap);
68 int my_fprintf(FILE *f, const char *fmt, ...);
69
70 int my_vprintf(const char *fmt, va_list ap);
71 int my_printf(const char *fmt, ...);
72
73 #endif