root / prex-0.9.0 / bsp / boot / common / printf.c @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*-
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2 | * Copyright (c) 2005, Kohsuke Ohtani
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without
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6 | * modification, are permitted provided that the following conditions
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7 | * are met:
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8 | * 1. Redistributions of source code must retain the above copyright
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9 | * notice, this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | * 3. Neither the name of the author nor the names of any co-contributors
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14 | * may be used to endorse or promote products derived from this software
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15 | * without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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27 | * SUCH DAMAGE.
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28 | */
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29 | |||
30 | /*
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31 | * printf.c - print formatted string
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32 | */
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33 | |||
34 | #include <sys/types.h> |
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35 | #include <machine/stdarg.h> |
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36 | #include <boot.h> |
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37 | #include <machdep.h> /* for debug_putc */ |
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38 | |||
39 | #ifdef DEBUG
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40 | |||
41 | void
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42 | printf(const char *fmt, ...) |
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43 | { |
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44 | static const char digits[] = "0123456789abcdef"; |
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45 | va_list ap; |
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46 | char buf[10]; |
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47 | char *s;
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48 | unsigned u;
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49 | int c, i, pad;
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50 | |||
51 | va_start(ap, fmt); |
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52 | while ((c = *fmt++) != 0) { |
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53 | if (c == '%') { |
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54 | c = *fmt++; |
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55 | /* ignore long */
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56 | if (c == 'l') |
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57 | c = *fmt++; |
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58 | switch (c) {
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59 | case 'c': |
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60 | debug_putc(va_arg(ap, int));
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61 | continue;
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62 | case 's': |
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63 | s = va_arg(ap, char *);
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64 | if (s == NULL) |
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65 | s = "<NULL>";
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66 | for (; *s; s++) {
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67 | debug_putc((int)*s);
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68 | } |
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69 | continue;
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70 | case 'd': |
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71 | c = 'u';
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72 | case 'u': |
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73 | case 'x': |
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74 | u = va_arg(ap, unsigned);
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75 | s = buf; |
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76 | if (c == 'u') { |
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77 | do
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78 | *s++ = digits[u % 10U];
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79 | while (u /= 10U); |
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80 | } else {
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81 | pad = 0;
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82 | for (i = 0; i < 8; i++) { |
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83 | if (pad)
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84 | *s++ = '0';
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85 | else {
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86 | *s++ = digits[u % 16U];
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87 | if ((u /= 16U) == 0) |
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88 | pad = 1;
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89 | } |
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90 | } |
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91 | } |
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92 | while (--s >= buf)
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93 | debug_putc((int)*s);
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94 | continue;
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95 | } |
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96 | } |
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97 | if (c == '\n') |
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98 | debug_putc('\r');
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99 | debug_putc((int)c);
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100 | } |
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101 | va_end(ap); |
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102 | } |
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103 | |||
104 | #endif /* !DEBUG */ |