projects / unix-history / blame
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1 | /*- |
| 2 | * Copyright (c) 1990 The Regents of the University of California. | |
| 3 | * All rights reserved. | |
| 4 | * | |
| c0567266 KB |
5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions | |
| 7 | * are met: | |
| 8 | * 1. Redistributions of source code must retain the above copyright | |
| 9 | * notice, this list of conditions and the following disclaimer. | |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright | |
| 11 | * notice, this list of conditions and the following disclaimer in the | |
| 12 | * documentation and/or other materials provided with the distribution. | |
| 13 | * 3. All advertising materials mentioning features or use of this software | |
| 14 | * must display the following acknowledgement: | |
| 15 | * This product includes software developed by the University of | |
| 16 | * California, Berkeley and its contributors. | |
| 17 | * 4. Neither the name of the University nor the names of its contributors | |
| 18 | * may be used to endorse or promote products derived from this software | |
| 19 | * without specific prior written permission. | |
| 20 | * | |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 31 | * SUCH DAMAGE. | |
| 8daa207b KB |
32 | */ |
| 33 | ||
| 34 | #if defined(LIBC_SCCS) && !defined(lint) | |
| 1c15e888 | 35 | .asciz "@(#)strcspn.s 5.1 (Berkeley) 5/15/90" |
| 8daa207b KB |
36 | #endif /* LIBC_SCCS and not lint */ |
| 37 | ||
| 38 | /* | |
| 39 | * Span the complement of string s2 (skip characters that are not in s2). | |
| 40 | * Return the number of characters in s1 that were skipped. | |
| 41 | * | |
| 42 | * size_t | |
| 43 | * strcspn(s1, s2) | |
| 44 | * const char *s1, *s2; | |
| 45 | */ | |
| 46 | #include "DEFS.h" | |
| 47 | ||
| 48 | ENTRY(strcspn, 0) | |
| 49 | subl2 $32,sp /* make 256 bit table */ | |
| 50 | movc5 $0,(sp),$0,$32,(sp) | |
| 51 | movq 4(ap),r1 /* r1 = s1, r2 = s2 */ | |
| 52 | ||
| 53 | /* turn on bit for each character in s2, including '\0' */ | |
| 54 | 1: | |
| 55 | movzbl (r2)+,r0 | |
| 56 | bbss r0,(sp),1b | |
| 57 | bneq 1b | |
| 58 | movl r1,r0 /* r0 = s (current pos in s1) */ | |
| 59 | ||
| 60 | /* look for a character that is in s2 */ | |
| 61 | 2: | |
| 62 | movzbl (r0)+,r2 /* c = *s++ */ | |
| 63 | bbc r2,(sp),2b /* loop until c is in table */ | |
| 64 | decl r0 /* s-- */ | |
| 65 | subl2 r1,r0 /* r0 = s - s1 = count */ | |
| 66 | ret |