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 | * $Id$ |
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34 | */ |
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35 | |
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36 | #if defined(LIBC_SCCS) && !defined(lint) |
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37 | static const char sccsid[] = "@(#)strsep.c 8.1 (Berkeley) 6/4/93"; |
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38 | #endif /* LIBC_SCCS and not lint */ |
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39 | |
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40 | #include <string.h> |
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41 | #include <stdio.h> |
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42 | |
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43 | /* |
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44 | * Get next token from string *stringp, where tokens are possibly-empty |
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45 | * strings separated by characters from delim. |
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46 | * |
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47 | * Writes NULs into the string at *stringp to end tokens. |
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48 | * delim need not remain constant from call to call. |
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49 | * On return, *stringp points past the last NUL written (if there might |
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50 | * be further tokens), or is NULL (if there are definitely no more tokens). |
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51 | * |
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52 | * If *stringp is NULL, strsep returns NULL. |
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53 | * |
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54 | * PUBLIC: #ifndef HAVE_STRSEP |
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55 | * PUBLIC: char *strsep __P((char **, const char *)); |
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56 | * PUBLIC: #endif |
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57 | */ |
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58 | char * |
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59 | strsep(stringp, delim) |
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60 | register char **stringp; |
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61 | register const char *delim; |
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62 | { |
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63 | register char *s; |
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64 | register const char *spanp; |
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65 | register int c, sc; |
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66 | char *tok; |
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67 | |
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68 | if ((s = *stringp) == NULL) |
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69 | return (NULL); |
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70 | for (tok = s;;) { |
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71 | c = *s++; |
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72 | spanp = delim; |
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73 | do { |
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74 | if ((sc = *spanp++) == c) { |
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75 | if (c == 0) |
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76 | s = NULL; |
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77 | else |
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78 | s[-1] = 0; |
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79 | *stringp = s; |
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80 | return (tok); |
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81 | } |
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82 | } while (sc != 0); |
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83 | } |
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84 | /* NOTREACHED */ |
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85 | } |
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