Chameleon

Chameleon Svn Source Tree

Root/branches/ErmaC/Enoch/i386/libsa/string.c

1/*␊
2 * Copyright (c) 1999-2003 Apple Computer, Inc. All rights reserved.␊
3 *␊
4 * @APPLE_LICENSE_HEADER_START@␊
5 * ␊
6 * Portions Copyright (c) 1999-2003 Apple Computer, Inc. All Rights␊
7 * Reserved. This file contains Original Code and/or Modifications of␊
8 * Original Code as defined in and that are subject to the Apple Public␊
9 * Source License Version 2.0 (the "License"). You may not use this file␊
10 * except in compliance with the License. Please obtain a copy of the␊
11 * License at http://www.apple.com/publicsource and read it before using␊
12 * this file.␊
13 * ␊
14 * The Original Code and all software distributed under the License are␊
15 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER␊
16 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,␊
17 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,␊
18 * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT. Please see the␊
19 * License for the specific language governing rights and limitations␊
20 * under the License.␊
21 * ␊
22 * @APPLE_LICENSE_HEADER_END@␊
23 */␊
24/* string operations */␊
25␊
26#include "libsa.h"␊
27␊
28void *memset(void * dst, int val, size_t len)␊
29{␊
30␉asm volatile ( "rep; stosb"␊
31␉␉: "=c" (len), "=D" (dst)␊
32␉␉: "0" (len), "1" (dst), "a" (val)␊
33␉␉: "memory" );␊
34␊
35␉return dst;␊
36}␊
37␊
38#if 0␊
39void * memcpy(void * dst, const void * src, size_t len)␊
40{␊
41␉asm volatile ( "rep; movsb"␊
42␉␉: "=c" (len), "=D" (dst), "=S" (src)␊
43␉␉: "0" (len), "1" (dst), "2" (src)␊
44␉␉: "memory" );␊
45␊
46␉return dst;␊
47}␊
48␊
49void bcopy(const void * src, void * dst, size_t len)␊
50{␊
51␉memcpy(dst, src, len);␊
52}␊
53␊
54void bzero(void * dst, size_t len)␊
55{␊
56␉memset(dst, 0, len);␊
57}␊
58␊
59void __bzero(void * dst, size_t len)␊
60{␊
61␉memset(dst, 0, len);␊
62}␊
63␊
64#else␊
65void * memcpy(void * dst, const void * src, size_t len)␊
66{␊
67␉asm volatile ( "cld \n\t"␊
68␉␉"movl %%ecx, %%edx \n\t"␊
69␉␉"shrl $2, %%ecx \n\t"␊
70␉␉"rep; movsl \n\t"␊
71␉␉"movl %%edx, %%ecx \n\t"␊
72␉␉"andl $3, %%ecx \n\t"␊
73␉␉"rep; movsb \n\t"␊
74␉␉: "=D" (dst)␊
75␉␉: "c" (len), "D" (dst), "S" (src)␊
76␉␉: "memory", "%edx" );␊
77␊
78␉return dst;␊
79}␊
80␊
81void bcopy(const void * src, void * dst, size_t len)␊
82{␊
83␉asm volatile ( "cld \n\t"␊
84␉␉"movl %%ecx, %%edx \n\t"␊
85␉␉"shrl $2, %%ecx \n\t"␊
86␉␉"rep; movsl \n\t"␊
87␉␉"movl %%edx, %%ecx \n\t"␊
88␉␉"andl $3, %%ecx \n\t"␊
89␉␉"rep; movsb \n\t"␊
90␉␉:␊
91␉␉: "c" (len), "D" (dst), "S" (src)␊
92␉␉: "memory", "%edx" );␊
93}␊
94␊
95void bzero(void * dst, size_t len)␊
96{␊
97␉asm volatile ( "xorl %%eax, %%eax \n\t"␊
98␉␉"cld \n\t"␊
99␉␉"movl %%ecx, %%edx \n\t"␊
100␉␉"shrl $2, %%ecx \n\t"␊
101␉␉"rep; stosl \n\t"␊
102␉␉"movl %%edx, %%ecx \n\t"␊
103␉␉"andl $3, %%ecx \n\t"␊
104␉␉"rep; stosb \n\t"␊
105␉␉:␊
106␉␉: "c" (len), "D" (dst)␊
107␉␉: "memory", "%eax" );␊
108}␊
109␊
110void __bzero(void * dst, size_t len)␊
111{␊
112␉asm volatile ( "xorl %%eax, %%eax \n\t"␊
113␉␉"cld \n\t"␊
114␉␉"movl %%ecx, %%edx \n\t"␊
115␉␉"shrl $2, %%ecx \n\t"␊
116␉␉"rep; stosl \n\t"␊
117␉␉"movl %%edx, %%ecx \n\t"␊
118␉␉"andl $3, %%ecx \n\t"␊
119␉␉"rep; stosb \n\t"␊
120␉␉:␊
121␉␉: "c" (len), "D" (dst)␊
122␉␉: "memory", "%eax" );␊
123}␊
124␊
125#endif␊
126␊
127/* #if DONT_USE_GCC_BUILT_IN_STRLEN */␊
128␊
129#define tolower(c) ((int)((c) & ~0x20))␊
130#define toupper(c) ((int)((c) | 0x20))␊
131␊
132size_t strlen(const char * s)␊
133{␊
134␉const char* save = s;␊
135␉while (*s++);␊
136␉return (--s) - save;␊
137}␊
138␊
139/*#endif*/␊
140␊
141/* NOTE: Moved from ntfs.c */␊
142int␊
143memcmp(const void *p1, const void *p2, size_t len)␊
144{␊
145 while (len--) {␊
146 if (*(const char*)(p1++) != *(const char*)(p2++))␊
147 return -1;␊
148 }␊
149 return 0;␊
150}␊
151␊
152int␊
153strcmp(const char * s1, const char * s2)␊
154{␊
155␉while (*s1 && (*s1 == *s2)) {␊
156␉␉s1++;␊
157␉␉s2++;␊
158␉}␊
159␉return (*s1 - *s2);␊
160}␊
161␊
162/* Derived from FreeBSD source */␊
163int strncmp(const char * s1, const char * s2, size_t n)␊
164{␊
165␉if (!n)␊
166␉␉return 0;␊
167␉do {␊
168␉␉if (*s1 != *s2++)␊
169␉␉{␊
170␉␉␉return (*(const unsigned char *)s1 - *(const unsigned char *)(s2 - 1));␊
171␉␉}␊
172␊
173␉␉if (!*s1++)␊
174␉␉{␊
175␉␉␉break;␊
176␉␉}␊
177␉} while (--n);␊
178␉return 0;␊
179}␊
180␊
181char *strcpy(char *s1, const char *s2)␊
182{␊
183␉register char *ret = s1;␊
184␉while ((*s1++ = *s2++))␊
185␉␉continue;␊
186␉return ret;␊
187}␊
188␊
189char *stpcpy(char *s1, const char *s2)␊
190{␊
191␉while ((*s1++ = *s2++))␊
192␉{␊
193␉␉continue;␊
194␉}␊
195␉return --s1;␊
196}␊
197␊
198char *strncpy(char *s1, const char *s2, size_t n)␊
199{␊
200␉register char *ret = s1;␊
201␉while (n && (*s1++ = *s2++))␊
202␉--n;␊
203␊
204␉if (n > 0) {␊
205␉␉bzero(s1, n);␊
206␉}␊
207␉return ret;␊
208}␊
209␊
210char *stpncpy(char *s1, const char *s2, size_t n)␊
211{␊
212␉while (n && (*s1++ = *s2++))␊
213␉␉--n;␊
214␉if (n > 0)␊
215␉{␊
216␉␉bzero(s1, n);␊
217␉}␊
218␉return s1;␊
219}␊
220␊
221char *strstr(const char *in, const char *str)␊
222{␊
223 char c;␊
224 size_t len;␊
225␊
226 c = *str++;␊
227 if (!c)␊
228 return (char *) in;␉// Trivial empty string case␊
229␊
230 len = strlen(str);␊
231 do {␊
232 char sc;␊
233␊
234 do {␊
235 sc = *in++;␊
236 if (!sc)␊
237 return (char *) 0;␊
238 } while (sc != c);␊
239 } while (strncmp(in, str, len) != 0);␊
240␊
241 return (char *) (in - 1);␊
242}␊
243␊
244int ptol(const char *str)␊
245{␊
246␉register int c = *str;␊
247␊
248␉if (c <= '7' && c >= '0')␊
249␉␉c -= '0';␊
250␉else if (c <= 'h' && c >= 'a')␊
251␉␉c -= 'a';␊
252␉else c = 0;␊
253␉return c;␊
254}␊
255␊
256int atoi(const char *str)␊
257{␊
258␉register int sum = 0;␊
259␉while (*str == ' ' || *str == '\t')␊
260␉␉str++;␊
261␉while (*str >= '0' && *str <= '9') {␊
262␉␉sum *= 10;␊
263␉␉sum += *str++ - '0';␊
264␉}␊
265␉return sum;␊
266}␊
267/*␊
268 * Appends src to string dst of size siz (unlike strncat, siz is the␊
269 * full size of dst, not space left). At most siz-1 characters␊
270 * will be copied. Always NUL terminates (unless siz <= strlen(dst)).␊
271 * Returns strlen(src) + MIN(siz, strlen(initial dst)).␊
272 * If retval >= siz, truncation occurred.␊
273 */␊
274size_t strlcat(char *dst, const char *src, size_t siz)␊
275{␊
276␉char *d = dst;␊
277␉const char *s = src;␊
278␉size_t n = siz;␊
279␉size_t dlen;␊
280␊
281␉/* Find the end of dst and adjust bytes left but don't go past end */␊
282␉while (n-- != 0 && *d != '\0')␊
283␉{␊
284␉␉d++;␊
285␉}␊
286␊
287␉dlen = d - dst;␊
288␉n = siz - dlen;␊
289␊
290␉if (n == 0)␊
291␉{␊
292␉␉return(dlen + strlen(s));␊
293␉}␊
294␊
295␉while (*s != '\0')␊
296␉{␊
297␉␉if (n != 1)␊
298␉␉{␊
299␉␉␉*d++ = *s;␊
300␉␉␉n--;␊
301␉␉}␊
302␉␉s++;␊
303␉}␊
304␉*d = '\0';␊
305␊
306␉return(dlen + (s - src)); /* count does not include NUL */␊
307}␊
308␊
309char *strncat(char *s1, const char *s2, size_t n)␊
310{␊
311␉register char *ret = s1;␊
312␉while (*s1)␊
313␉␉s1++;␊
314␉while (n-- && (*s1++ = *s2++));␊
315␉return ret;␊
316}␊
317␊
318char *strcat(char *s1, const char *s2)␊
319{␊
320␉register char *ret = s1;␊
321␉while (*s1)␊
322␉{␊
323␉␉s1++;␊
324␉}␊
325␉while ((*s1++ = *s2++));␊
326␉return ret;␊
327}␊
328␊
329char *strdup(const char *s1)␊
330{␊
331␉return strcpy(malloc(strlen(s1) + 1), s1);␊
332}␊
333␊
334#if STRNCASECMP␊
335int strncasecmp(const char *s1, const char *s2, size_t len)␊
336{␊
337␉register int n = len;␊
338␉while (--n >= 0 && tolower(*s1) == tolower(*s2++))␊
339␉␉if (*s1++ == '\0')␊
340␉␉␉return(0);␊
341␉return(n<0 ? 0 : tolower(*s1) - tolower(*--s2));␊
342}␊
343#endif␊
344␊
345char *strchr(const char *str, int c)␊
346{␊
347 do␊
348 {␊
349 if(*str == c)␊
350 return (char*)str;␊
351 }␊
352 while(*(str++));␊
353 ␊
354 return 0;␊
355}␊
356␊
357char *strbreak(const char *str, char **next, long *len)␊
358{␊
359 char *start = (char*)str, *end;␊
360 bool quoted = false;␊
361 ␊
362 if ( !start || !len )␊
363 return 0;␊
364 ␊
365 *len = 0;␊
366 ␊
367 while ( isspace(*start) )␊
368 start++;␊
369 ␊
370 if (*start == '"')␊
371 {␊
372 start++;␊
373␊
374 end = strchr(start, '"');␊
375 if(end)␊
376 quoted = true;␊
377 else␊
378 end = strchr(start, '\0');␊
379 }␊
380 else␊
381 {␊
382 for ( end = start; *end && !isspace(*end); end++ )␊
383 {}␊
384 }␊
385␊
386 *len = end - start;␊
387␊
388 if(next)␊
389 *next = quoted ? end+1 : end;␊
390␊
391 return start;␊
392}␊
393␊
394/* COPYRIGHT NOTICE: checksum8 from AppleSMBIOS */␊
395uint8_t checksum8( void *start, unsigned int length )␊
396{␊
397␉uint8_t␉csum = 0;␊
398␉uint8_t␉*cp = (uint8_t *) start;␊
399␉unsigned int i;␊
400␊
401␉for ( i = 0; i < length; i++)␊
402␉{␊
403␉␉csum += *cp++;␊
404␉}␊
405␉return csum;␊
406}␊
407␊
408

Archive Download this file

Revision: 2714