scoutos / prex-0.9.0 / usr / lib / libc / string / strtok_r.c @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /* $NetBSD: strtok_r.c,v 1.9 2003/08/07 16:43:53 agc Exp $ */
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3 | /*
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4 | * Copyright (c) 1988 Regents of the University of California.
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5 | * All rights reserved.
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6 | *
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7 | * Redistribution and use in source and binary forms, with or without
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8 | * modification, are permitted provided that the following conditions
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9 | * are met:
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10 | * 1. Redistributions of source code must retain the above copyright
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11 | * notice, this list of conditions and the following disclaimer.
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12 | * 2. Redistributions in binary form must reproduce the above copyright
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13 | * notice, this list of conditions and the following disclaimer in the
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14 | * documentation and/or other materials provided with the distribution.
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15 | * 3. Neither the name of the University nor the names of its contributors
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16 | * may be used to endorse or promote products derived from this software
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17 | * without specific prior written permission.
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18 | *
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19 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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29 | * SUCH DAMAGE.
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30 | */
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31 | |||
32 | #include <sys/cdefs.h> |
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33 | #include <string.h> |
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34 | |||
35 | char *
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36 | strtok_r(s, delim, lasts) |
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37 | char *s;
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38 | const char *delim; |
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39 | char **lasts;
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40 | { |
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41 | const char *spanp; |
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42 | int c, sc;
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43 | char *tok;
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44 | |||
45 | if (s == NULL && (s = *lasts) == NULL) |
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46 | return (NULL); |
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47 | |||
48 | /*
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49 | * Skip (span) leading delimiters (s += strspn(s, delim), sort of).
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50 | */
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51 | cont:
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52 | c = *s++; |
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53 | for (spanp = delim; (sc = *spanp++) != 0;) { |
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54 | if (c == sc)
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55 | goto cont;
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56 | } |
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57 | |||
58 | if (c == 0) { /* no non-delimiter characters */ |
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59 | *lasts = NULL;
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60 | return (NULL); |
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61 | } |
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62 | tok = s - 1;
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63 | |||
64 | /*
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65 | * Scan token (scan for delimiters: s += strcspn(s, delim), sort of).
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66 | * Note that delim must have one NUL; we stop if we see that, too.
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67 | */
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68 | for (;;) {
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69 | c = *s++; |
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70 | spanp = delim; |
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71 | do {
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72 | if ((sc = *spanp++) == c) {
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73 | if (c == 0) |
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74 | s = NULL;
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75 | else
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76 | s[-1] = 0; |
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77 | *lasts = s; |
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78 | return (tok);
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79 | } |
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80 | } while (sc != 0); |
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81 | } |
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82 | /* NOTREACHED */
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83 | } |