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1 | /* av.c |
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2 | * |
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3 | * Copyright (c) 1991-1994, Larry Wall |
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4 | * |
5 | * You may distribute under the terms of either the GNU General Public |
6 | * License or the Artistic License, as specified in the README file. |
7 | * |
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8 | */ |
9 | |
10 | /* |
11 | * "...for the Entwives desired order, and plenty, and peace (by which they |
12 | * meant that things should remain where they had set them)." --Treebeard |
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13 | */ |
14 | |
15 | #include "EXTERN.h" |
16 | #include "perl.h" |
17 | |
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18 | static void av_reify _((AV* av)); |
19 | |
20 | static void |
21 | av_reify(av) |
22 | AV* av; |
23 | { |
24 | I32 key; |
25 | SV* sv; |
26 | |
27 | key = AvMAX(av) + 1; |
28 | while (key > AvFILL(av) + 1) |
29 | AvARRAY(av)[--key] = &sv_undef; |
30 | while (key) { |
31 | sv = AvARRAY(av)[--key]; |
32 | assert(sv); |
33 | if (sv != &sv_undef) |
34 | (void)SvREFCNT_inc(sv); |
35 | } |
36 | AvREAL_on(av); |
37 | } |
38 | |
39 | void |
40 | av_extend(av,key) |
41 | AV *av; |
42 | I32 key; |
43 | { |
44 | if (key > AvMAX(av)) { |
45 | SV** ary; |
46 | I32 tmp; |
47 | I32 newmax; |
48 | |
49 | if (AvALLOC(av) != AvARRAY(av)) { |
50 | ary = AvALLOC(av) + AvFILL(av) + 1; |
51 | tmp = AvARRAY(av) - AvALLOC(av); |
52 | Move(AvARRAY(av), AvALLOC(av), AvFILL(av)+1, SV*); |
53 | AvMAX(av) += tmp; |
54 | SvPVX(av) = (char*)AvALLOC(av); |
55 | if (AvREAL(av)) { |
56 | while (tmp) |
57 | ary[--tmp] = &sv_undef; |
58 | } |
59 | |
60 | if (key > AvMAX(av) - 10) { |
61 | newmax = key + AvMAX(av); |
62 | goto resize; |
63 | } |
64 | } |
65 | else { |
66 | if (AvALLOC(av)) { |
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67 | U32 bytes; |
68 | |
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69 | newmax = key + AvMAX(av) / 5; |
70 | resize: |
4633a7c4 |
71 | #ifdef STRANGE_MALLOC |
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72 | Renew(AvALLOC(av),newmax+1, SV*); |
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73 | #else |
74 | bytes = (newmax + 1) * sizeof(SV*); |
75 | #define MALLOC_OVERHEAD 16 |
76 | tmp = MALLOC_OVERHEAD; |
77 | while (tmp - MALLOC_OVERHEAD < bytes) |
78 | tmp += tmp; |
79 | tmp -= MALLOC_OVERHEAD; |
80 | tmp /= sizeof(SV*); |
81 | assert(tmp > newmax); |
82 | newmax = tmp - 1; |
83 | New(2,ary, newmax+1, SV*); |
84 | Copy(AvALLOC(av), ary, AvMAX(av)+1, SV*); |
85 | if (AvMAX(av) > 64 && !AvREUSED(av)) |
86 | sv_add_arena((char*)AvALLOC(av), AvMAX(av) * sizeof(SV*),0); |
87 | else |
88 | Safefree(AvALLOC(av)); |
89 | AvALLOC(av) = ary; |
90 | #endif |
a0d0e21e |
91 | ary = AvALLOC(av) + AvMAX(av) + 1; |
92 | tmp = newmax - AvMAX(av); |
93 | if (av == stack) { /* Oops, grew stack (via av_store()?) */ |
94 | stack_sp = AvALLOC(av) + (stack_sp - stack_base); |
95 | stack_base = AvALLOC(av); |
96 | stack_max = stack_base + newmax; |
97 | } |
98 | } |
99 | else { |
100 | newmax = key < 4 ? 4 : key; |
101 | New(2,AvALLOC(av), newmax+1, SV*); |
102 | ary = AvALLOC(av) + 1; |
103 | tmp = newmax; |
104 | AvALLOC(av)[0] = &sv_undef; /* For the stacks */ |
105 | } |
106 | if (AvREAL(av)) { |
107 | while (tmp) |
108 | ary[--tmp] = &sv_undef; |
109 | } |
110 | |
111 | SvPVX(av) = (char*)AvALLOC(av); |
112 | AvMAX(av) = newmax; |
113 | } |
114 | } |
115 | } |
116 | |
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117 | SV** |
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118 | av_fetch(av,key,lval) |
119 | register AV *av; |
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120 | I32 key; |
121 | I32 lval; |
122 | { |
123 | SV *sv; |
124 | |
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125 | if (!av) |
126 | return 0; |
127 | |
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128 | if (SvRMAGICAL(av)) { |
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129 | if (mg_find((SV*)av,'P')) { |
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130 | sv = sv_newmortal(); |
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131 | mg_copy((SV*)av, sv, 0, key); |
463ee0b2 |
132 | Sv = sv; |
133 | return &Sv; |
134 | } |
135 | } |
136 | |
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137 | if (key < 0) { |
138 | key += AvFILL(av) + 1; |
139 | if (key < 0) |
140 | return 0; |
141 | } |
142 | else if (key > AvFILL(av)) { |
143 | if (!lval) |
144 | return 0; |
145 | if (AvREALISH(av)) |
146 | sv = NEWSV(5,0); |
147 | else |
148 | sv = sv_newmortal(); |
149 | return av_store(av,key,sv); |
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150 | } |
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151 | if (AvARRAY(av)[key] == &sv_undef) { |
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152 | if (lval) { |
153 | sv = NEWSV(6,0); |
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154 | return av_store(av,key,sv); |
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155 | } |
156 | return 0; |
157 | } |
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158 | return &AvARRAY(av)[key]; |
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159 | } |
160 | |
161 | SV** |
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162 | av_store(av,key,val) |
163 | register AV *av; |
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164 | I32 key; |
165 | SV *val; |
166 | { |
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167 | SV** ary; |
168 | |
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169 | if (!av) |
170 | return 0; |
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171 | |
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172 | if (SvRMAGICAL(av)) { |
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173 | if (mg_find((SV*)av,'P')) { |
174 | mg_copy((SV*)av, val, 0, key); |
175 | return 0; |
176 | } |
177 | } |
178 | |
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179 | if (key < 0) { |
180 | key += AvFILL(av) + 1; |
181 | if (key < 0) |
182 | return 0; |
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183 | } |
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184 | if (!val) |
185 | val = &sv_undef; |
186 | |
187 | if (key > AvMAX(av)) |
188 | av_extend(av,key); |
189 | if (AvREIFY(av)) |
190 | av_reify(av); |
191 | |
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192 | ary = AvARRAY(av); |
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193 | if (AvFILL(av) < key) { |
194 | if (!AvREAL(av)) { |
195 | if (av == stack && key > stack_sp - stack_base) |
196 | stack_sp = stack_base + key; /* XPUSH in disguise */ |
197 | do |
198 | ary[++AvFILL(av)] = &sv_undef; |
199 | while (AvFILL(av) < key); |
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200 | } |
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201 | AvFILL(av) = key; |
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202 | } |
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203 | else if (AvREAL(av)) |
204 | SvREFCNT_dec(ary[key]); |
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205 | ary[key] = val; |
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206 | if (SvSMAGICAL(av)) { |
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207 | if (val != &sv_undef) { |
208 | MAGIC* mg = SvMAGIC(av); |
209 | sv_magic(val, (SV*)av, toLOWER(mg->mg_type), 0, key); |
210 | } |
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211 | mg_set((SV*)av); |
212 | } |
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213 | return &ary[key]; |
214 | } |
215 | |
216 | AV * |
217 | newAV() |
218 | { |
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219 | register AV *av; |
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220 | |
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221 | av = (AV*)NEWSV(3,0); |
222 | sv_upgrade((SV *)av, SVt_PVAV); |
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223 | AvREAL_on(av); |
224 | AvALLOC(av) = 0; |
225 | SvPVX(av) = 0; |
226 | AvMAX(av) = AvFILL(av) = -1; |
227 | return av; |
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228 | } |
229 | |
230 | AV * |
231 | av_make(size,strp) |
232 | register I32 size; |
233 | register SV **strp; |
234 | { |
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235 | register AV *av; |
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236 | register I32 i; |
237 | register SV** ary; |
238 | |
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239 | av = (AV*)NEWSV(8,0); |
240 | sv_upgrade((SV *) av,SVt_PVAV); |
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241 | New(4,ary,size+1,SV*); |
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242 | AvALLOC(av) = ary; |
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243 | AvFLAGS(av) = AVf_REAL; |
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244 | SvPVX(av) = (char*)ary; |
245 | AvFILL(av) = size - 1; |
246 | AvMAX(av) = size - 1; |
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247 | for (i = 0; i < size; i++) { |
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248 | assert (*strp); |
249 | ary[i] = NEWSV(7,0); |
250 | sv_setsv(ary[i], *strp); |
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251 | strp++; |
252 | } |
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253 | return av; |
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254 | } |
255 | |
256 | AV * |
257 | av_fake(size,strp) |
258 | register I32 size; |
259 | register SV **strp; |
260 | { |
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261 | register AV *av; |
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262 | register SV** ary; |
263 | |
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264 | av = (AV*)NEWSV(9,0); |
265 | sv_upgrade((SV *)av, SVt_PVAV); |
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266 | New(4,ary,size+1,SV*); |
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267 | AvALLOC(av) = ary; |
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268 | Copy(strp,ary,size,SV*); |
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269 | AvFLAGS(av) = AVf_REIFY; |
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270 | SvPVX(av) = (char*)ary; |
271 | AvFILL(av) = size - 1; |
272 | AvMAX(av) = size - 1; |
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273 | while (size--) { |
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274 | assert (*strp); |
275 | SvTEMP_off(*strp); |
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276 | strp++; |
277 | } |
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278 | return av; |
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279 | } |
280 | |
281 | void |
463ee0b2 |
282 | av_clear(av) |
283 | register AV *av; |
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284 | { |
285 | register I32 key; |
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286 | SV** ary; |
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287 | |
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288 | if (!av || AvMAX(av) < 0) |
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289 | return; |
290 | /*SUPPRESS 560*/ |
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291 | |
292 | if (AvREAL(av)) { |
293 | ary = AvARRAY(av); |
294 | key = AvFILL(av) + 1; |
295 | while (key) { |
296 | SvREFCNT_dec(ary[--key]); |
297 | ary[key] = &sv_undef; |
298 | } |
299 | } |
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300 | if (key = AvARRAY(av) - AvALLOC(av)) { |
301 | AvMAX(av) += key; |
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302 | SvPVX(av) = (char*)AvALLOC(av); |
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303 | } |
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304 | AvFILL(av) = -1; |
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305 | } |
306 | |
307 | void |
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308 | av_undef(av) |
309 | register AV *av; |
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310 | { |
311 | register I32 key; |
312 | |
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313 | if (!av) |
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314 | return; |
315 | /*SUPPRESS 560*/ |
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316 | if (AvREAL(av)) { |
317 | key = AvFILL(av) + 1; |
318 | while (key) |
319 | SvREFCNT_dec(AvARRAY(av)[--key]); |
320 | } |
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321 | if (key = AvARRAY(av) - AvALLOC(av)) { |
322 | AvMAX(av) += key; |
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323 | SvPVX(av) = (char*)AvALLOC(av); |
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324 | } |
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325 | Safefree(AvALLOC(av)); |
326 | AvALLOC(av) = 0; |
327 | SvPVX(av) = 0; |
328 | AvMAX(av) = AvFILL(av) = -1; |
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329 | AvREUSED_on(av); /* Avoid leak of making SVs out of old memory again. */ |
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330 | if (AvARYLEN(av)) { |
331 | SvREFCNT_dec(AvARYLEN(av)); |
332 | AvARYLEN(av) = 0; |
333 | } |
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334 | } |
335 | |
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336 | void |
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337 | av_push(av,val) |
338 | register AV *av; |
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339 | SV *val; |
340 | { |
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341 | if (!av) |
342 | return; |
343 | av_store(av,AvFILL(av)+1,val); |
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344 | } |
345 | |
346 | SV * |
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347 | av_pop(av) |
348 | register AV *av; |
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349 | { |
350 | SV *retval; |
351 | |
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352 | if (!av || AvFILL(av) < 0) |
353 | return &sv_undef; |
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354 | retval = AvARRAY(av)[AvFILL(av)]; |
a0d0e21e |
355 | AvARRAY(av)[AvFILL(av)--] = &sv_undef; |
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356 | if (SvSMAGICAL(av)) |
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357 | mg_set((SV*)av); |
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358 | return retval; |
359 | } |
360 | |
361 | void |
463ee0b2 |
362 | av_unshift(av,num) |
363 | register AV *av; |
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364 | register I32 num; |
365 | { |
366 | register I32 i; |
367 | register SV **sstr,**dstr; |
368 | |
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369 | if (!av || num <= 0) |
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370 | return; |
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371 | if (!AvREAL(av)) { |
372 | if (AvREIFY(av)) |
373 | av_reify(av); |
374 | else |
375 | croak("Can't unshift"); |
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376 | } |
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377 | i = AvARRAY(av) - AvALLOC(av); |
378 | if (i) { |
379 | if (i > num) |
380 | i = num; |
381 | num -= i; |
382 | |
383 | AvMAX(av) += i; |
384 | AvFILL(av) += i; |
385 | SvPVX(av) = (char*)(AvARRAY(av) - i); |
386 | } |
387 | if (num) { |
388 | av_extend(av,AvFILL(av)+num); |
389 | AvFILL(av) += num; |
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390 | dstr = AvARRAY(av) + AvFILL(av); |
79072805 |
391 | sstr = dstr - num; |
392 | #ifdef BUGGY_MSC5 |
393 | # pragma loop_opt(off) /* don't loop-optimize the following code */ |
394 | #endif /* BUGGY_MSC5 */ |
a0d0e21e |
395 | for (i = AvFILL(av) - num; i >= 0; --i) { |
79072805 |
396 | *dstr-- = *sstr--; |
397 | #ifdef BUGGY_MSC5 |
398 | # pragma loop_opt() /* loop-optimization back to command-line setting */ |
399 | #endif /* BUGGY_MSC5 */ |
400 | } |
a0d0e21e |
401 | while (num) |
402 | AvARRAY(av)[--num] = &sv_undef; |
79072805 |
403 | } |
404 | } |
405 | |
406 | SV * |
463ee0b2 |
407 | av_shift(av) |
408 | register AV *av; |
79072805 |
409 | { |
410 | SV *retval; |
411 | |
a0d0e21e |
412 | if (!av || AvFILL(av) < 0) |
413 | return &sv_undef; |
463ee0b2 |
414 | retval = *AvARRAY(av); |
a0d0e21e |
415 | if (AvREAL(av)) |
416 | *AvARRAY(av) = &sv_undef; |
463ee0b2 |
417 | SvPVX(av) = (char*)(AvARRAY(av) + 1); |
418 | AvMAX(av)--; |
419 | AvFILL(av)--; |
8990e307 |
420 | if (SvSMAGICAL(av)) |
463ee0b2 |
421 | mg_set((SV*)av); |
79072805 |
422 | return retval; |
423 | } |
424 | |
425 | I32 |
463ee0b2 |
426 | av_len(av) |
427 | register AV *av; |
79072805 |
428 | { |
463ee0b2 |
429 | return AvFILL(av); |
79072805 |
430 | } |
431 | |
432 | void |
463ee0b2 |
433 | av_fill(av, fill) |
434 | register AV *av; |
79072805 |
435 | I32 fill; |
436 | { |
a0d0e21e |
437 | if (!av) |
438 | croak("panic: null array"); |
79072805 |
439 | if (fill < 0) |
440 | fill = -1; |
463ee0b2 |
441 | if (fill <= AvMAX(av)) { |
a0d0e21e |
442 | I32 key = AvFILL(av); |
443 | SV** ary = AvARRAY(av); |
444 | |
445 | if (AvREAL(av)) { |
446 | while (key > fill) { |
447 | SvREFCNT_dec(ary[key]); |
448 | ary[key--] = &sv_undef; |
449 | } |
450 | } |
451 | else { |
452 | while (key < fill) |
453 | ary[++key] = &sv_undef; |
454 | } |
455 | |
463ee0b2 |
456 | AvFILL(av) = fill; |
8990e307 |
457 | if (SvSMAGICAL(av)) |
463ee0b2 |
458 | mg_set((SV*)av); |
459 | } |
a0d0e21e |
460 | else |
461 | (void)av_store(av,fill,&sv_undef); |
79072805 |
462 | } |