This source file includes following definitions.
- strcpy
- strncpy
- strcat
- strncat
- strcmp
- strncmp
- strchr
- strrchr
- strspn
- strcspn
- strpbrk
- strstr
- strlen
- strtok
- memcpy
- memmove
- memcmp
- memchr
- memset
1 #ifndef _LINUX_STRING_H_
2 #define _LINUX_STRING_H_
3
4 #include <linux/types.h>
5
6 #ifndef NULL
7 #define NULL ((void *) 0)
8 #endif
9
10 #ifdef __cplusplus
11 extern "C" {
12 #endif
13
14
15
16
17
18
19
20
21
22
23
24
25
26 extern inline char * strcpy(char * dest,const char *src)
27 {
28 __asm__("cld\n"
29 "1:\tlodsb\n\t"
30 "stosb\n\t"
31 "testb %%al,%%al\n\t"
32 "jne 1b"
33 :
34 :"S" (src),"D" (dest):"si","di","ax","memory");
35 return dest;
36 }
37
38 extern inline char * strncpy(char * dest,const char *src,size_t count)
39 {
40 __asm__("cld\n"
41 "1:\tdecl %2\n\t"
42 "js 2f\n\t"
43 "lodsb\n\t"
44 "stosb\n\t"
45 "testb %%al,%%al\n\t"
46 "jne 1b\n\t"
47 "rep\n\t"
48 "stosb\n"
49 "2:"
50 :
51 :"S" (src),"D" (dest),"c" (count):"si","di","ax","cx","memory");
52 return dest;
53 }
54
55 extern inline char * strcat(char * dest,const char * src)
56 {
57 __asm__("cld\n\t"
58 "repne\n\t"
59 "scasb\n\t"
60 "decl %1\n"
61 "1:\tlodsb\n\t"
62 "stosb\n\t"
63 "testb %%al,%%al\n\t"
64 "jne 1b"
65 :
66 :"S" (src),"D" (dest),"a" (0),"c" (0xffffffff):"si","di","ax","cx");
67 return dest;
68 }
69
70 extern inline char * strncat(char * dest,const char * src,size_t count)
71 {
72 __asm__("cld\n\t"
73 "repne\n\t"
74 "scasb\n\t"
75 "decl %1\n\t"
76 "movl %4,%3\n"
77 "1:\tdecl %3\n\t"
78 "js 2f\n\t"
79 "lodsb\n\t"
80 "stosb\n\t"
81 "testb %%al,%%al\n\t"
82 "jne 1b\n"
83 "2:\txorl %2,%2\n\t"
84 "stosb"
85 :
86 :"S" (src),"D" (dest),"a" (0),"c" (0xffffffff),"g" (count)
87 :"si","di","ax","cx","memory");
88 return dest;
89 }
90
91 extern inline int strcmp(const char * cs,const char * ct)
92 {
93 register int __res __asm__("ax");
94 __asm__("cld\n"
95 "1:\tlodsb\n\t"
96 "scasb\n\t"
97 "jne 2f\n\t"
98 "testb %%al,%%al\n\t"
99 "jne 1b\n\t"
100 "xorl %%eax,%%eax\n\t"
101 "jmp 3f\n"
102 "2:\tsbbl %%eax,%%eax\n\t"
103 "orb $1,%%eax\n"
104 "3:"
105 :"=a" (__res):"S" (cs),"D" (ct):"si","di");
106 return __res;
107 }
108
109 extern inline int strncmp(const char * cs,const char * ct,size_t count)
110 {
111 register int __res __asm__("ax");
112 __asm__("cld\n"
113 "1:\tdecl %3\n\t"
114 "js 2f\n\t"
115 "lodsb\n\t"
116 "scasb\n\t"
117 "jne 3f\n\t"
118 "testb %%al,%%al\n\t"
119 "jne 1b\n"
120 "2:\txorl %%eax,%%eax\n\t"
121 "jmp 4f\n"
122 "3:\tsbbl %%eax,%%eax\n\t"
123 "orb $1,%%al\n"
124 "4:"
125 :"=a" (__res):"S" (cs),"D" (ct),"c" (count):"si","di","cx");
126 return __res;
127 }
128
129 extern inline char * strchr(const char * s,char c)
130 {
131 register char * __res __asm__("ax");
132 __asm__("cld\n\t"
133 "movb %%al,%%ah\n"
134 "1:\tlodsb\n\t"
135 "cmpb %%ah,%%al\n\t"
136 "je 2f\n\t"
137 "testb %%al,%%al\n\t"
138 "jne 1b\n\t"
139 "movl $1,%1\n"
140 "2:\tmovl %1,%0\n\t"
141 "decl %0"
142 :"=a" (__res):"S" (s),"0" (c):"si");
143 return __res;
144 }
145
146 extern inline char * strrchr(const char * s,char c)
147 {
148 register char * __res __asm__("dx");
149 __asm__("cld\n\t"
150 "movb %%al,%%ah\n"
151 "1:\tlodsb\n\t"
152 "cmpb %%ah,%%al\n\t"
153 "jne 2f\n\t"
154 "leal -1(%%esi),%0\n"
155 "2:\ttestb %%al,%%al\n\t"
156 "jne 1b"
157 :"=d" (__res):"0" (0),"S" (s),"a" (c):"ax","si");
158 return __res;
159 }
160
161 extern inline size_t strspn(const char * cs, const char * ct)
162 {
163 register char * __res __asm__("si");
164 __asm__("cld\n\t"
165 "movl %4,%%edi\n\t"
166 "repne\n\t"
167 "scasb\n\t"
168 "notl %%ecx\n\t"
169 "decl %%ecx\n\t"
170 "movl %%ecx,%%edx\n"
171 "1:\tlodsb\n\t"
172 "testb %%al,%%al\n\t"
173 "je 2f\n\t"
174 "movl %4,%%edi\n\t"
175 "movl %%edx,%%ecx\n\t"
176 "repne\n\t"
177 "scasb\n\t"
178 "je 1b\n"
179 "2:\tdecl %0"
180 :"=S" (__res):"a" (0),"c" (0xffffffff),"0" (cs),"g" (ct)
181 :"ax","cx","dx","di");
182 return __res-cs;
183 }
184
185 extern inline size_t strcspn(const char * cs, const char * ct)
186 {
187 register char * __res __asm__("si");
188 __asm__("cld\n\t"
189 "movl %4,%%edi\n\t"
190 "repne\n\t"
191 "scasb\n\t"
192 "notl %%ecx\n\t"
193 "decl %%ecx\n\t"
194 "movl %%ecx,%%edx\n"
195 "1:\tlodsb\n\t"
196 "testb %%al,%%al\n\t"
197 "je 2f\n\t"
198 "movl %4,%%edi\n\t"
199 "movl %%edx,%%ecx\n\t"
200 "repne\n\t"
201 "scasb\n\t"
202 "jne 1b\n"
203 "2:\tdecl %0"
204 :"=S" (__res):"a" (0),"c" (0xffffffff),"0" (cs),"g" (ct)
205 :"ax","cx","dx","di");
206 return __res-cs;
207 }
208
209 extern inline char * strpbrk(const char * cs,const char * ct)
210 {
211 register char * __res __asm__("si");
212 __asm__("cld\n\t"
213 "movl %4,%%edi\n\t"
214 "repne\n\t"
215 "scasb\n\t"
216 "notl %%ecx\n\t"
217 "decl %%ecx\n\t"
218 "movl %%ecx,%%edx\n"
219 "1:\tlodsb\n\t"
220 "testb %%al,%%al\n\t"
221 "je 2f\n\t"
222 "movl %4,%%edi\n\t"
223 "movl %%edx,%%ecx\n\t"
224 "repne\n\t"
225 "scasb\n\t"
226 "jne 1b\n\t"
227 "decl %0\n\t"
228 "jmp 3f\n"
229 "2:\txorl %0,%0\n"
230 "3:"
231 :"=S" (__res):"a" (0),"c" (0xffffffff),"0" (cs),"g" (ct)
232 :"ax","cx","dx","di");
233 return __res;
234 }
235
236 extern inline char * strstr(const char * cs,const char * ct)
237 {
238 register char * __res __asm__("ax");
239 __asm__("cld\n\t" \
240 "movl %4,%%edi\n\t"
241 "repne\n\t"
242 "scasb\n\t"
243 "notl %%ecx\n\t"
244 "decl %%ecx\n\t"
245 "movl %%ecx,%%edx\n"
246 "1:\tmovl %4,%%edi\n\t"
247 "movl %%esi,%%eax\n\t"
248 "movl %%edx,%%ecx\n\t"
249 "repe\n\t"
250 "cmpsb\n\t"
251 "je 2f\n\t"
252 "xchgl %%eax,%%esi\n\t"
253 "incl %%esi\n\t"
254 "cmpb $0,-1(%%eax)\n\t"
255 "jne 1b\n\t"
256 "xorl %%eax,%%eax\n\t"
257 "2:"
258 :"=a" (__res):"0" (0),"c" (0xffffffff),"S" (cs),"g" (ct)
259 :"cx","dx","di","si");
260 return __res;
261 }
262
263 extern inline size_t strlen(const char * s)
264 {
265 register int __res __asm__("cx");
266 __asm__("cld\n\t"
267 "repne\n\t"
268 "scasb\n\t"
269 "notl %0\n\t"
270 "decl %0"
271 :"=c" (__res):"D" (s),"a" (0),"0" (0xffffffff):"di");
272 return __res;
273 }
274
275 extern char * ___strtok;
276
277 extern inline char * strtok(char * s,const char * ct)
278 {
279 register char * __res;
280 __asm__("testl %1,%1\n\t"
281 "jne 1f\n\t"
282 "testl %0,%0\n\t"
283 "je 8f\n\t"
284 "movl %0,%1\n"
285 "1:\txorl %0,%0\n\t"
286 "movl $-1,%%ecx\n\t"
287 "xorl %%eax,%%eax\n\t"
288 "cld\n\t"
289 "movl %4,%%edi\n\t"
290 "repne\n\t"
291 "scasb\n\t"
292 "notl %%ecx\n\t"
293 "decl %%ecx\n\t"
294 "je 7f\n\t"
295 "movl %%ecx,%%edx\n"
296 "2:\tlodsb\n\t"
297 "testb %%al,%%al\n\t"
298 "je 7f\n\t"
299 "movl %4,%%edi\n\t"
300 "movl %%edx,%%ecx\n\t"
301 "repne\n\t"
302 "scasb\n\t"
303 "je 2b\n\t"
304 "decl %1\n\t"
305 "cmpb $0,(%1)\n\t"
306 "je 7f\n\t"
307 "movl %1,%0\n"
308 "3:\tlodsb\n\t"
309 "testb %%al,%%al\n\t"
310 "je 5f\n\t"
311 "movl %4,%%edi\n\t"
312 "movl %%edx,%%ecx\n\t"
313 "repne\n\t"
314 "scasb\n\t"
315 "jne 3b\n\t"
316 "decl %1\n\t"
317 "cmpb $0,(%1)\n\t"
318 "je 5f\n\t"
319 "movb $0,(%1)\n\t"
320 "incl %1\n\t"
321 "jmp 6f\n"
322 "5:\txorl %1,%1\n"
323 "6:\tcmpb $0,(%0)\n\t"
324 "jne 7f\n\t"
325 "xorl %0,%0\n"
326 "7:\ttestl %0,%0\n\t"
327 "jne 8f\n\t"
328 "movl %0,%1\n"
329 "8:"
330 :"=b" (__res),"=S" (___strtok)
331 :"0" (___strtok),"1" (s),"g" (ct)
332 :"ax","cx","dx","di","memory");
333 return __res;
334 }
335
336 extern inline void * memcpy(void * to, const void * from, size_t n)
337 {
338 __asm__("cld\n\t"
339 "movl %%edx, %%ecx\n\t"
340 "shrl $2,%%ecx\n\t"
341 "rep ; movsl\n\t"
342 "testb $1,%%dl\n\t"
343 "je 1f\n\t"
344 "movsb\n"
345 "1:\ttestb $2,%%dl\n\t"
346 "je 2f\n\t"
347 "movsw\n"
348 "2:\n"
349 :
350 :"d" (n),"D" ((long) to),"S" ((long) from)
351 : "cx","di","si","memory");
352 return (to);
353 }
354
355 extern inline void * memmove(void * dest,const void * src, size_t n)
356 {
357 if (dest<src)
358 __asm__("cld\n\t"
359 "rep\n\t"
360 "movsb"
361 :
362 :"c" (n),"S" (src),"D" (dest)
363 :"cx","si","di");
364 else
365 __asm__("std\n\t"
366 "rep\n\t"
367 "movsb\n\t"
368 "cld"
369 :
370 :"c" (n),
371 "S" (n-1+(const char *)src),
372 "D" (n-1+(char *)dest)
373 :"cx","si","di","memory");
374 return dest;
375 }
376
377 extern inline int memcmp(const void * cs,const void * ct,size_t count)
378 {
379 register int __res __asm__("ax");
380 __asm__("cld\n\t"
381 "repe\n\t"
382 "cmpsb\n\t"
383 "je 1f\n\t"
384 "sbbl %%eax,%%eax\n\t"
385 "orb $1,%%al\n"
386 "1:"
387 :"=a" (__res):"0" (0),"S" (cs),"D" (ct),"c" (count)
388 :"si","di","cx");
389 return __res;
390 }
391
392 extern inline void * memchr(const void * cs,char c,size_t count)
393 {
394 register void * __res __asm__("di");
395 if (!count)
396 return NULL;
397 __asm__("cld\n\t"
398 "repne\n\t"
399 "scasb\n\t"
400 "je 1f\n\t"
401 "movl $1,%0\n"
402 "1:\tdecl %0"
403 :"=D" (__res):"a" (c),"D" (cs),"c" (count)
404 :"cx");
405 return __res;
406 }
407
408 extern inline void * memset(void * s,char c,size_t count)
409 {
410 __asm__("cld\n\t"
411 "rep\n\t"
412 "stosb"
413 :
414 :"a" (c),"D" (s),"c" (count)
415 :"cx","di","memory");
416 return s;
417 }
418
419 #ifdef __cplusplus
420 }
421 #endif
422
423 #endif
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