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annotate target-utils/libc/strtoul.c @ 609:ffd606adb039

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CHANGES: libserial ASYNC_LOW_LATENCY change documented
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 22 Feb 2020 19:07:46 +0000
parents d8d03dafb9c0
children
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96
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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 }