FreeCalypso > hg > freecalypso-tools
annotate target-utils/libc/strtoul.c @ 407:19e5a3e2f9c0
fcup-settime: moved time() retrieval a little closer to the output
A fundamental problem with all simple time transfer tools is that there is
always some delay between the time retrieval on the source system and that
transmitted time being set on the destination, and the resulting time
on the destination system is off by that delay amount. This delay cannot
be fully eliminated when working in a simple environment like ours,
but we should make our best effort to minimize it. In the present case,
moving the atinterf_init() call before the time() retrieval should make
a teensy-tiny improvement.
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sat, 11 Aug 2018 21:52:17 +0000 |
parents | d8d03dafb9c0 |
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rev | line source |
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1 /* |
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2 * Copyright (c) 1990, 1993 |
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3 * The Regents of the University of California. 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. All advertising materials mentioning features or use of this software |
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14 * must display the following acknowledgement: |
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15 * This product includes software developed by the University of |
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16 * California, Berkeley and its contributors. |
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17 * 4. Neither the name of the University nor the names of its contributors |
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18 * may be used to endorse or promote products derived from this software |
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19 * without specific prior written permission. |
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20 * |
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21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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31 * SUCH DAMAGE. |
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32 */ |
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33 |
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34 /* |
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35 * Embedded libc note: the present version of strtoul() has been |
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36 * simplified in that overflow checking has been removed. |
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37 * This simplification is needed for embedded systems in which |
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38 * there is no UNIX-style errno global variable. |
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39 */ |
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40 |
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41 #include <ctype.h> |
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42 |
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43 /* |
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44 * Convert a string to an unsigned long integer. |
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45 * |
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46 * Ignores `locale' stuff. Assumes that the upper and lower case |
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47 * alphabets and digits are each contiguous. |
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48 */ |
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49 unsigned long |
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50 strtoul(nptr, endptr, base) |
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51 const char *nptr; |
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52 char **endptr; |
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53 register int base; |
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54 { |
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55 register const char *s = nptr; |
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56 register unsigned long acc; |
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57 register int c; |
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58 register int neg = 0, any; |
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59 |
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60 /* |
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61 * See strtol for comments as to the logic used. |
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62 */ |
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63 do { |
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64 c = *s++; |
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65 } while (isspace(c)); |
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66 if (c == '-') { |
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67 neg = 1; |
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68 c = *s++; |
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69 } else if (c == '+') |
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70 c = *s++; |
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71 if ((base == 0 || base == 16) && |
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72 c == '0' && (*s == 'x' || *s == 'X')) { |
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73 c = s[1]; |
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74 s += 2; |
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75 base = 16; |
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76 } |
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77 if (base == 0) |
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78 base = c == '0' ? 8 : 10; |
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79 |
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80 for (acc = 0, any = 0;; c = *s++) { |
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81 if (isdigit(c)) |
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82 c -= '0'; |
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83 else if (isalpha(c)) |
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84 c -= isupper(c) ? 'A' - 10 : 'a' - 10; |
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85 else |
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86 break; |
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87 if (c >= base) |
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88 break; |
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89 any = 1; |
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90 acc *= base; |
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91 acc += c; |
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92 } |
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93 if (neg) |
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94 acc = -acc; |
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95 if (endptr != 0) |
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96 *endptr = (char *)(any ? s - 1 : nptr); |
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97 return (acc); |
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98 } |