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