Commit | Line | Data |
00701878 |
1 | /* buffers.h -- Version 1.11 */ |
2 | |
3 | /* The following abbreviations are used at start of parameter names |
4 | * to indicate the type of data: |
5 | * s string (char * or WCHAR *) [PV] |
6 | * sw wide string (WCHAR *) [PV] |
7 | * p pointer (usually to some structure) [PV] |
8 | * a array (packed array as in C) (usually of some structure) [PV] |
9 | * called a "vector" or "vect" in some places. |
10 | * n generic number [IV, UV, or NV] |
11 | * iv signed integral value [IV] |
12 | * u unsigned integral value [UV] |
13 | * d floating-point number (double) [NV] |
14 | * b boolean (bool) [IV] |
15 | * c count of items [UV] |
16 | * l length (in bytes) [UV] |
17 | * lw length in WCHARs [UV] |
18 | * h a handle [IV] |
19 | * r record (structure) [PV] |
20 | * sv Perl scalar (s, i, u, d, n, or rv) [SV] |
21 | * rv Perl reference (usually to scalar) [RV] |
22 | * hv reference to Perl hash [HV] |
23 | * av reference to Perl array [AV] |
24 | * cv Perl code reference [PVCV] |
25 | * |
26 | * Unusual combined types: |
27 | * pp single pointer (to non-Perl data) packed into string [PV] |
28 | * pap vector of pointers (to non-Perl data) packed into string [PV] |
29 | * |
30 | * Whether a parameter is for input data, output data, or both is usually |
31 | * not reflected by the data type prefix. In cases where this is not |
32 | * obvious nor reflected in the variable name proper, you can use |
33 | * the following in front of the data type prefix: |
34 | * i an input parameter given to API (usually omitted) |
35 | * o an Output parameter taken from API |
36 | * io Input given to API then overwritten with Output taken from API |
37 | */ |
38 | |
39 | /* Buffer arguments are usually followed by an argument (or two) specifying |
40 | * their size and/or returning the size of data written. The size can be |
41 | * measured in bytes ["lSize"] or in characters [for (char *) buffers such as |
42 | * for *A() routines, these sizes are also called "lSize", but are called |
43 | * "lwSize" for (WCHAR *) buffers, UNICODE strings, such as for *W() routines]. |
44 | * |
45 | * Before calling the actual C function, you must make sure the Perl variable |
46 | * actually has a big enough buffer allocated, and, if the user didn't want |
47 | * to specify a buffer size, set the buffer size to be correct. This is what |
48 | * the grow_*() macros are for. They also handle special meanings of the |
49 | * buffer size argument [described below]. |
50 | * |
51 | * Once the actual C function returns, you must set the Perl variable to know |
52 | * the size of the written data. This is what the trunc_*() macros are for. |
53 | * |
54 | * The size sometimes does and sometimes doesn't include the trailing '\0' |
55 | * [or L'\0'], so we always add or substract 1 in the appropriate places so |
56 | * we don't care about this detail. |
57 | * |
58 | * A call may 1) request a pointer to the buffer size which means that |
59 | * the buffer size will be overwritten with the size of the data written; |
60 | * 2) have an extra argument which is a pointer to the place to write the |
61 | * size of the written data; 3) provide the size of the written data in |
62 | * the function's return value; 4) format the data so that the length |
63 | * can be determined by examining the data [such as with '\0'-terminated |
64 | * strings]; or 5) write fixed-length data [usually sizeof(STRUCT)]. |
65 | * This obviously determines what you should use in the trunc_*() macro |
66 | # to specify the size of the output value. |
67 | * |
68 | * The user can pass in an empty list reference, C<[]>, to indicate C<NULL> |
69 | * for the pointer to the buffer which means that they don't want that data. |
70 | * |
71 | * The user can pass in C<[]> or C<0> to indicate that they don't care about |
72 | * the buffer size [we aren't programming in C here, after all] and just try |
73 | * to get the data. This will work if either the buffer already alloated for |
74 | * the SV [scalar value] is large enough to hold the data or the API provides |
75 | * an easy way to determine the required size [and the XS code uses it]. |
76 | * |
77 | * If the user passes in a numeric value for a buffer size, then the XS |
78 | * code makes sure that the buffer is at least large enough to hold a value |
79 | * of that size and then passes in how large the buffer is. So the buffer |
80 | * size passed to the API call is the larger of the size requested by the |
81 | * user and the size of the buffer aleady allocated to the SV. |
82 | * |
83 | * The user can also pass in a string consisting of a leading "=" followed |
84 | * by digits for a buffer size. This means just use the size specified after |
85 | * the equals sign, even if the allocated buffer is larger. The XS code will |
86 | * still allocate a large enough buffer before the first call. |
87 | * |
88 | * If the function is nice enough to tell us that a buffer was too small |
89 | * [usually via ERROR_MORE_DATA] _and_ how large the buffer needs to be, |
90 | * then the XS code should enlarge the buffer(s) and repeat the call [once]. |
91 | * This resizing is _not_ done for buffers whose size was specified with a |
92 | * leading "=". |
93 | * |
94 | * Only grow_buf() and perhaps trunc_buf() can be used in a typemap file. |
95 | * The other macros would be used in the parameter declarations or INPUT: |
96 | * section [grow_*()], the INIT: section [init_*()], or the OUTPUT: section |
97 | * [trunc_*()]. |
98 | * |
99 | * Buffer arguments should be initialied with C<= NO_INIT> [or C<= NULL;>]. |
100 | * |
101 | * See also the F<typemap> file. C<oDWORD>, for example, is for an output- |
102 | * only parameter of type C<DWORD> and you should simply C<#define> it to be |
103 | * C<DWORD>. In F<typemap>, C<oDWORD> is treated differently than C<DWORD> |
104 | * in two ways. |
105 | * |
106 | * First, if C<undef> is passed in, a C<DWORD> could generate a warning |
107 | * when it gets converted to 0 while C<oDWORD> will never generate such a |
108 | * warning for C<undef>. This first difference doesn't apply if specific |
109 | * initialization is specified for the variable, as in C<= init_buf_l($var);>. |
110 | * In particular, the init_*() macros also convert C<undef> to 0 without |
111 | * ever producing a warning. |
112 | * |
113 | * Second, passing in a read-only SV for a C<oDWORD> parameter will generate |
114 | * a fatal error on output when we try to update the SV. For C<DWORD>, we |
115 | * won't update a read-only SV since passing in a literal constant for a |
116 | * buffer size is a useful thing to do even though it prevents us from |
117 | * returning the size of data written via that SV. Since we should use a |
118 | * trunc_*() macro to output the actual data, the user should be able to |
119 | * determine the size of data written based on the size of the scalar we |
120 | * output anyway. |
121 | * |
122 | * This second difference doesn't apply unless the paremter is listed in |
123 | * the OUTPUT: section without specific output instructions. We define |
124 | * no macros for outputing buffer length parameters so be careful to use |
125 | * C<oDWORD> [for example] for them if and only if they are output-only. |
126 | * |
127 | * Note that C<oDWORD> is the same as C<DWORD> in that, if a defined value |
128 | * is passed in, it is used [and can generate a warning if the value is |
129 | * "not numeric"]. So although C<oDWORD> is for output-only parameters, |
130 | * we still initialize the C variable before calling the API. This is good |
131 | * in case the parameter isn't always strictly output-only due to upgrades, |
132 | * bugs, etc. |
133 | * |
134 | * Here is a made-up example that shows several cases: |
135 | * |
136 | * # Actual GetDataW() returns length of data written to ioswName, not bool. |
137 | * bool |
138 | * GetDataW( ioswName, ilwName, oswText, iolwText, opJunk, opRec, ilRec, olRec ) |
139 | * WCHAR * ioswName = NO_INIT |
140 | * DWORD ilwName = NO_INIT |
141 | * WCHAR * oswText = NO_INIT |
142 | * DWORD &iolwText = init_buf_l($arg); |
143 | * void * opJunk = NO_INIT |
144 | * BYTE * opRec = NO_INIT |
145 | * DWORD ilRec = init_buf_l($arg); |
146 | * oDWORD &olRec |
147 | * PREINIT: |
148 | * DWORD olwName; |
149 | * INIT: |
150 | * grow_buf_lw( ioswName,ST(0), ilwName,ST(1) ); |
151 | * grow_buf_lw( oswText,ST(2), iolwText,ST(3) ); |
152 | * grow_buf_typ( opJunk,ST(4),void *, LONG_STRUCT_TYPEDEF ); |
153 | * grow_buf_l( opRec,ST(5),BYTE *, ilRec,ST(6) ); |
154 | * CODE: |
155 | * olwName= GetDataW( ioswName, ilwName, oswText, &iolwText, |
156 | * (LONG_STRUCT_TYPEDEF *)opJunk, opRec, &iolRec ); |
157 | * if( 0 == olwName && ERROR_MORE_DATA == GetLastError() |
158 | * && ( autosize(ST(1)) || autosize(ST(3)) || autosize(ST(6)) ) ) { |
159 | * if( autosize(ST(1)) ) |
160 | * grow_buf_lw( ioswName,ST(0), ilwName,ST(1) ); |
161 | * if( autosize(ST(3)) ) |
162 | * grow_buf_lw( oswText,ST(2), iolwText,ST(3) ); |
163 | * if( autosize(ST(6)) ) |
164 | * grow_buf_l( opRec,ST(5),BYTE *, iolRec,ST(6) ); |
165 | * olwName= GetDataW( ioswName, ilwName, oswText, &iolwText, |
166 | * (LONG_STRUCT_TYPEDEF *)opJunk, opRec, &iolRec ); |
167 | * } |
168 | * RETVAL= 0 != olwName; |
169 | * OUTPUT: |
170 | * RETVAL |
171 | * ioswName trunc_buf_lw( RETVAL, ioswName,ST(0), olwName ); |
172 | * oswText trunc_buf_lw( RETVAL, oswText,ST(2), iolwText ); |
173 | * iolwText |
174 | * opJunk trunc_buf_typ(RETVAL,opJunk,ST(4),LONG_STRUCT_TYPEDEF); |
175 | * opRec trunc_buf_l( RETVAL, opRec,ST(5), olRec ); |
176 | * olRec |
177 | * |
178 | * The above example would be more complex and less efficient if we used |
179 | * C<DWORD * iolwText> in place of C<DWORD &iolwText>. The only possible |
180 | * advantage would be that C<NULL> would be passed in for C<iolwText> if |
181 | * _both_ C<$oswText> and C<$iolwText> were specified as C<[]>. The *_pl*() |
182 | * macros are defined [and C<DWORD *> specified in F<typemap>] so we can |
183 | * handle those cases but it is usually better to use the *_l*() macros |
184 | * instead by specifying C<&> instead of C<*>. Using C<&> instead of C<*> |
185 | * is usually better when dealing with scalars, even if they aren't buffer |
186 | * sizes. But you must use C<*> if it is important for that parameter to |
187 | * be able to pass C<NULL> to the underlying API. |
188 | * |
189 | * In Win32API::, we try to use C<*> for buffer sizes of optional buffers |
190 | * and C<&> for buffer sizes of required buffers. |
191 | * |
192 | * For parameters that are pointers to things other than buffers or buffer |
193 | * sizes, we use C<*> for "important" parameters [so that using C<[]> |
194 | * generates an error rather than fetching the value and just throwing it |
195 | * away], and for optional parameters [in case specifying C<NULL> is or |
196 | * becomes important]. Otherwise we use C<&> [for "unimportant" but |
197 | * required parameters] so the user can specify C<[]> if they don't care |
198 | * about it. The output handle of an "open" routine is "important". |
199 | */ |
200 | |
201 | #ifndef Debug |
202 | # define Debug(list) /*Nothing*/ |
203 | #endif |
204 | |
205 | /*#ifndef CAST |
206 | *# ifdef __cplusplus |
207 | *# define CAST(type,expr) static_cast<type>(expr) |
208 | *# else*/ |
209 | # define CAST(type,expr) (type)(expr) |
210 | /*# endif |
211 | *#endif*/ |
212 | |
213 | /* Is an argument C<[]>, meaning we should pass C<NULL>? */ |
214 | #define null_arg(sv) ( SvROK(sv) && SVt_PVAV == SvTYPE(SvRV(sv)) \ |
215 | && -1 == av_len((AV*)SvRV(sv)) ) |
216 | |
bfd025d9 |
217 | #define PV_or_null(sv) ( null_arg(sv) ? NULL : SvPV_nolen(sv) ) |
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218 | |
219 | /* Minimum buffer size to use when no buffer existed: */ |
220 | #define MIN_GROW_SIZE 128 |
221 | |
222 | #ifdef Debug |
223 | /* Used in Debug() messages to show which macro call is involved: */ |
224 | #define string(arg) #arg |
225 | #endif |
226 | |
227 | /* Simplify using SvGROW() for byte-sized buffers: */ |
228 | #define lSvGROW(sv,n) SvGROW( sv, 0==(n) ? MIN_GROW_SIZE : (n)+1 ) |
229 | |
230 | /* Simplify using SvGROW() for WCHAR-sized buffers: */ |
231 | #define lwSvGROW(sv,n) CAST( WCHAR *, \ |
232 | SvGROW( sv, sizeof(WCHAR)*( 0==(n) ? MIN_GROW_SIZE : (n)+1 ) ) ) |
233 | |
234 | /* Whether the buffer size we got lets us change what buffer size we use: */ |
235 | #define autosize(sv) (!( SvOK(sv) && ! SvROK(sv) \ |
bfd025d9 |
236 | && SvPV_nolen(sv) && '=' == *SvPV_nolen(sv) )) |
00701878 |
237 | |
238 | /* Get the IV/UV for a parameter that might be C<[]> or C<undef>: */ |
239 | #define optIV(sv) ( null_arg(sv) ? 0 : !SvOK(sv) ? 0 : SvIV(sv) ) |
240 | #define optUV(sv) ( null_arg(sv) ? 0 : !SvOK(sv) ? 0 : SvUV(sv) ) |
241 | |
242 | /* Allocate temporary storage that will automatically be freed later: */ |
243 | #ifndef TempAlloc /* Can be C<#define>d to be C<_alloca>, for example */ |
244 | # define TempAlloc( size ) sv_grow( sv_newmortal(), size ) |
245 | #endif |
246 | |
247 | /* Initialize a buffer size argument of type (DWORD *): */ |
248 | #define init_buf_pl( plSize, svSize, tpSize ) STMT_START { \ |
249 | if( null_arg(svSize) ) \ |
250 | plSize= NULL; \ |
251 | else { \ |
252 | STRLEN n_a; \ |
253 | *( plSize= CAST( tpSize, TempAlloc(sizeof(*plSize)) ) )= \ |
254 | autosize(svSize) ? optUV(svSize) \ |
255 | : strtoul( 1+SvPV(svSize,n_a), NULL, 10 ); \ |
256 | } } STMT_END |
257 | /* In INPUT section put ": init_buf_pl($var,$arg,$type);" after var name. */ |
258 | |
259 | /* Initialize a buffer size argument of type DWORD: */ |
260 | #define init_buf_l( svSize ) \ |
261 | ( null_arg(svSize) ? 0 : autosize(svSize) ? optUV(svSize) \ |
bfd025d9 |
262 | : strtoul( 1+SvPV_nolen(svSize), NULL, 10 ) ) |
00701878 |
263 | /* In INPUT section put "= init_buf_l($arg);" after variable name. */ |
264 | |
265 | /* Lengths in WCHARs are initialized the same as lengths in bytes: */ |
266 | #define init_buf_plw init_buf_pl |
267 | #define init_buf_lw init_buf_l |
268 | |
269 | /* grow_buf_pl() and grow_buf_plw() are included so you can define |
270 | * parameters of type C<DWORD *>, for example. In practice, it is |
271 | * usually better to define such parameters as "DWORD &". */ |
272 | |
273 | /* Grow a buffer where we have a pointer to its size in bytes: */ |
274 | #define grow_buf_pl( sBuf,svBuf,tpBuf, plSize,svSize,tpSize ) STMT_START { \ |
275 | Debug(("grow_buf_pl( %s==0x%lX,[%s:%ld/%ld, %s==0x%lX:%ld,[%s )\n",\ |
276 | string(sBuf),sBuf,strchr(string(svBuf),'('),SvPOK(svBuf)? \ |
277 | SvCUR(svBuf):-1,SvPOK(svBuf)?SvLEN(svBuf):-1,string(plSize), \ |
278 | plSize,plSize?*plSize:-1,strchr(string(svSize),'('))); \ |
279 | if( null_arg(svBuf) ) { \ |
280 | sBuf= NULL; \ |
281 | } else { \ |
282 | STRLEN n_a; \ |
283 | if( NULL == plSize ) \ |
284 | *( plSize= CAST(tpSize,TempAlloc(sizeof(*plSize))) )= 0;\ |
285 | if( ! SvOK(svBuf) ) sv_setpvn(svBuf,"",0); \ |
286 | (void) SvPV_force( svBuf, n_a ); \ |
287 | sBuf= CAST( tpBuf, lSvGROW( svBuf, *plSize ) ); \ |
288 | if( autosize(svSize) ) *plSize= SvLEN(svBuf) - 1; \ |
289 | Debug(("more buf_pl( %s==0x%lX,[%s:%ld/%ld, %s==0x%lX:%ld,[%s )\n",\ |
290 | string(sBuf),sBuf,strchr(string(svBuf),'('),SvPOK(svBuf)? \ |
291 | SvCUR(svBuf):-1,SvPOK(svBuf)?SvLEN(svBuf):-1,string(plSize),\ |
292 | plSize,plSize?*plSize:-1,strchr(string(svSize),'('))); \ |
293 | } } STMT_END |
294 | |
295 | /* Grow a buffer where we have a pointer to its size in WCHARs: */ |
296 | #define grow_buf_plw( sBuf,svBuf, plwSize,svSize,tpSize ) STMT_START { \ |
297 | if( null_arg(svBuf) ) { \ |
298 | sBuf= NULL; \ |
299 | } else { \ |
300 | STRLEN n_a; \ |
301 | if( NULL == plwSize ) \ |
302 | *( plwSize= CAST(tpSize,TempAlloc(sizeof(*plwSize))) )= 0;\ |
303 | if( ! SvOK(svBuf) ) sv_setpvn(svBuf,"",0); \ |
304 | (void) SvPV_force( svBuf, n_a ); \ |
305 | sBuf= lwSvGROW( svBuf, *plwSize ); \ |
306 | if( autosize(svSize) ) \ |
307 | *plwSize= SvLEN(svBuf)/sizeof(WCHAR) - 1; \ |
308 | } } STMT_END |
309 | |
310 | /* Grow a buffer where we have its size in bytes: */ |
311 | #define grow_buf_l( sBuf,svBuf,tpBuf, lSize,svSize ) STMT_START { \ |
312 | if( null_arg(svBuf) ) { \ |
313 | sBuf= NULL; \ |
314 | } else { \ |
315 | STRLEN n_a; \ |
316 | if( ! SvOK(svBuf) ) sv_setpvn(svBuf,"",0); \ |
317 | (void) SvPV_force( svBuf, n_a ); \ |
318 | sBuf= CAST( tpBuf, lSvGROW( svBuf, lSize ) ); \ |
319 | if( autosize(svSize) ) lSize= SvLEN(svBuf) - 1; \ |
320 | } } STMT_END |
321 | |
322 | /* Grow a buffer where we have its size in WCHARs: */ |
323 | #define grow_buf_lw( swBuf,svBuf, lwSize,svSize ) STMT_START { \ |
324 | if( null_arg(svBuf) ) { \ |
325 | swBuf= NULL; \ |
326 | } else { \ |
327 | STRLEN n_a; \ |
328 | if( ! SvOK(svBuf) ) sv_setpvn(svBuf,"",0); \ |
329 | (void) SvPV_force( svBuf, n_a ); \ |
330 | swBuf= lwSvGROW( svBuf, lwSize ); \ |
331 | if( autosize(svSize) ) \ |
332 | lwSize= SvLEN(svBuf)/sizeof(WCHAR) - 1; \ |
333 | } } STMT_END |
334 | |
335 | /* Grow a buffer that contains the declared fixed data type: */ |
336 | #define grow_buf( pBuf,svBuf, tpBuf ) STMT_START { \ |
337 | if( null_arg(svBuf) ) { \ |
338 | pBuf= NULL; \ |
339 | } else { \ |
340 | STRLEN n_a; \ |
341 | if( ! SvOK(svBuf) ) sv_setpvn(svBuf,"",0); \ |
342 | (void) SvPV_force( svBuf, n_a ); \ |
343 | pBuf= CAST( tpBuf, SvGROW( svBuf, sizeof(*pBuf) ) ); \ |
344 | } } STMT_END |
345 | |
346 | /* Grow a buffer that contains a fixed data type other than that declared: */ |
347 | #define grow_buf_typ( pBuf,svBuf,tpBuf, Type ) STMT_START { \ |
348 | if( null_arg(svBuf) ) { \ |
349 | pBuf= NULL; \ |
350 | } else { \ |
351 | STRLEN n_a; \ |
352 | if( ! SvOK(svBuf) ) sv_setpvn(svBuf,"",0); \ |
353 | (void) SvPV_force( svBuf, n_a ); \ |
354 | pBuf= CAST( tpBuf, SvGROW( svBuf, sizeof(Type) ) ); \ |
355 | } } STMT_END |
356 | |
357 | /* Grow a buffer that contains a list of items of the declared data type: */ |
358 | #define grow_vect( pBuf,svBuf,tpBuf, cItems ) STMT_START { \ |
359 | if( null_arg(svBuf) ) { \ |
360 | pBuf= NULL; \ |
361 | } else { \ |
362 | STRLEN n_a; \ |
363 | if( ! SvOK(svBuf) ) sv_setpvn(svBuf,"",0); \ |
364 | (void) SvPV_force( svBuf, n_a ); \ |
365 | pBuf= CAST( tpBuf, SvGROW( svBuf, sizeof(*pBuf)*cItems ) ); \ |
366 | } } STMT_END |
367 | |
368 | /* If call succeeded, set data length to returned length (in bytes): */ |
369 | #define trunc_buf_l( bOkay, sBuf,svBuf, lSize ) STMT_START { \ |
370 | if( bOkay && NULL != sBuf ) { \ |
371 | SvPOK_only( svBuf ); \ |
372 | SvCUR_set( svBuf, lSize ); \ |
373 | } } STMT_END |
374 | |
375 | /* Same as above except we have a poitner to the returned length: */ |
376 | #define trunc_buf_pl( bOkay, sBuf,svBuf, plSize ) \ |
377 | trunc_buf_l( bOkay, sBuf,svBuf, *plSize ) |
378 | |
379 | /* If call succeeded, set data length to returned length (in WCHARs): */ |
380 | #define trunc_buf_lw( bOkay, sBuf,svBuf, lwSize ) STMT_START { \ |
381 | if( bOkay && NULL != sBuf ) { \ |
382 | SvPOK_only( svBuf ); \ |
383 | SvCUR_set( svBuf, (lwSize)*sizeof(WCHAR) ); \ |
384 | } } STMT_END |
385 | |
386 | /* Same as above except we have a poitner to the returned length: */ |
387 | #define trunc_buf_plw( bOkay, swBuf,svBuf, plwSize ) \ |
388 | trunc_buf_lw( bOkay, swBuf,svBuf, *plwSize ) |
389 | |
390 | /* Set data length for a buffer that contains the declared fixed data type: */ |
391 | #define trunc_buf( bOkay, pBuf,svBuf ) STMT_START { \ |
392 | if( bOkay && NULL != pBuf ) { \ |
393 | SvPOK_only( svBuf ); \ |
394 | SvCUR_set( svBuf, sizeof(*pBuf) ); \ |
395 | } } STMT_END |
396 | |
397 | /* Set data length for a buffer that contains some other fixed data type: */ |
398 | #define trunc_buf_typ( bOkay, pBuf,svBuf, Type ) STMT_START { \ |
399 | if( bOkay && NULL != pBuf ) { \ |
400 | SvPOK_only( svBuf ); \ |
401 | SvCUR_set( svBuf, sizeof(Type) ); \ |
402 | } } STMT_END |
403 | |
404 | /* Set length for buffer that contains list of items of the declared type: */ |
405 | #define trunc_vect( bOkay, pBuf,svBuf, cItems ) STMT_START { \ |
406 | if( bOkay && NULL != pBuf ) { \ |
407 | SvPOK_only( svBuf ); \ |
408 | SvCUR_set( svBuf, sizeof(*pBuf)*cItems ); \ |
409 | } } STMT_END |
410 | |
411 | /* Set data length for a buffer where a '\0'-terminate string was stored: */ |
412 | #define trunc_buf_z( bOkay, sBuf,svBuf ) STMT_START { \ |
413 | if( bOkay && NULL != sBuf ) { \ |
414 | SvPOK_only( svBuf ); \ |
415 | SvCUR_set( svBuf, strlen(sBuf) ); \ |
416 | } } STMT_END |
417 | |
418 | /* Set data length for a buffer where a L'\0'-terminate string was stored: */ |
419 | #define trunc_buf_zw( bOkay, sBuf,svBuf ) STMT_START { \ |
420 | if( bOkay && NULL != sBuf ) { \ |
421 | SvPOK_only( svBuf ); \ |
422 | SvCUR_set( svBuf, wcslen(sBuf)*sizeof(WCHAR) ); \ |
423 | } } STMT_END |