Repository navigation
Expand file tree
/
Copy pathprintf.w
More file actions
1115 lines (969 loc) · 25.7 KB
/
Copy pathprintf.w
File metadata and controls
1115 lines (969 loc) · 25.7 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
\input mwebmac
\input ctmac
\RCSID{$Id: printf.w,v 1.5 2016/07/25 14:55:24 mike Exp $}
\TOC{Mawk Printf}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\section{Introduction}
This is the source and documentation for a new [[mawk]] implementation
of [[s?printf()]]. The purpose of the reimplementation is,
\list
\item{(1)} Remove the use of a fixed buffer for [[sprintf()]].
\item{(2)} Handle null character, [['\0']], in the format string
and the argument strings.
\item{(3)} For integer formats, e.g. [[%d]], handle bigger integers.
The original implementation was restricted to 32-bit integers.
This implementation uses 64-bit integers.
\item{(4)} When the format string is a constant, which is the usual case,
parse it at compile-time as opposed to run-time. This removes
some redundant computation at run-time.
\endlist
\section{The Interface}
To execute [[printf(form,...)]] or [[sprintf(form,...)]], a call is
made to [[parse_form(form)]], which returns a [[const Form*]]. To the caller,
this is an abstract type.
<<[[printf]] definitions>>=
typedef struct form Form ;
const Form* parse_form(const STRING*) ;
@
To execute [[s?printf(form,arg1,...argn)]], a call is made to
[[do_xprint(fp,form,cp)]], where
\I[[fp]] is a [[FILE*]] for output or zero for [[sprintf]].
\I[[form]] is the [[const Form*]] returned from [[parse_form()]].
\I[[cp]] is a pointer to [[arg1..argn]] in an array of [[CELL]].
\endhitems
\noindent
If doing [[printf]], the return is zero. If doing [[sprintf]], the
return is the resulting [[STRING*]].
@
\section{Form Data}
This section handles the parsing and storage of [[form]] in
the function calls {\hfil\break}[[printf(form,...)]] and [[sprintf(form,...)]].
<<[[printf]] definitions>>=
typedef struct spec Spec ;
struct form {
Form* link ;
STRING* form ;
unsigned num_args ; /* number of args to satisfy form */
Spec* specs ; /* each %..C is one Spec */
STRING* ending ; /* after last Spec */
} ;
@ %def Form
All the [[Form]]s are kept on a singly linked list, [[the_forms]].
<<[[form]] definitions and data>>=
static Form* the_forms ;
@ %def the_forms
This function finds a [[form]] on the list. Successful search causes
move to the front.
<<[[printf]] functions>>=
static Form* find_form(const STRING* form)
{
Form* p = the_forms ;
Form* q = 0 ;
while(p) {
if (STRING_eq(form,p->form)) {
if (q) { /* move to the front */
q->link = p->link ;
p->link = the_forms ;
the_forms = p ;
}
return p ;
}
else {
q = p ;
p = p->link ;
}
}
/* not found */
return 0 ;
}
@ %def find_form
<<static prototypes>>=
static Form* find_form(const STRING*) ;
<<[[printf]] functions>>=
const Form* parse_form(const STRING* form)
{
Form* ret = find_form(form) ;
if (ret) return ret ;
ret = parse_form0(form) ;
/* zero if an error */
if (ret) {
ret->link = the_forms ;
the_forms = ret ;
}
return ret ;
}
@ %def parse_form
The real work of parsing a format happens here.
<<[[printf]] functions>>=
static Form* parse_form0(const STRING* form)
{
STRING* prefix ;
Spec tmp_head ;
Spec* tail = &tmp_head ;
char xbuffer[1024] ;
char* buffer = form->len <= 1024 ? xbuffer : (char*)emalloc(form->len) ;
const char* str = form->str ; /* walks form */
const char* end = str + form->len ;
tmp_head.link = 0 ;
Form* ret = (Form*)zmalloc(sizeof(Form)) ;
while(1) {
<<get the [[prefix]]>>
if (str == end)
<<done, so finish up and return>>
else {
str = parse_spec(str+1,end,tail) ;
if (str == 0) {
/* error, msg already done */
return 0 ;
}
tail = tail->link ;
tail->prefix = prefix ;
}
}
}
@ %def parse_form0
<<static prototypes>>=
static Form* parse_form0(const STRING*) ;
@
Everything up to a [[%]] goes into the [[prefix]], which is
collected in [[buffer]]. [[%%]] becomes [[%]] in the [[prefix]].
<<get the [[prefix]]>>=
{
char* bp = buffer ;
prefix = 0 ;
while(str < end) {
if (*str == '%') {
if (str[1] == '%') {
*bp++ = '%' ;
str += 2 ;
continue ;
}
else { /* prefix is done */
if (bp > buffer) {
prefix = new_STRING2(buffer, bp - buffer) ;
bp = buffer ;
}
break ;
}
}
else *bp++ = *str++ ;
}
if (bp > buffer) {
/* prefix is really the ending */
if (bp == buffer+1 && buffer[0] == '\n') {
prefix = STRING_dup(the_nl_str) ;
}
else {
prefix = new_STRING2(buffer, bp - buffer) ;
}
}
}
@
When we get here,
the collected [[prefix]] is actually the [[ending]], everything after
the last control character. This code finishes the construction
of the [[Form]], returning a pointer to it.
<<done, so finish up and return>>=
{
ret->ending = prefix ;
ret->form = STRING_dup(form) ;
ret->link = 0 ;
ret->specs = tmp_head.link ;
ret->num_args = 0 ;
{
const Spec* sp = ret->specs ;
while(sp) {
ret->num_args += 1 + sp->ast_cnt ;
sp = sp->link ;
}
}
if (buffer != xbuffer) free(buffer) ;
return ret ;
}
@
Often the [[ending]] is only a new-line, here is a [[STRING]]
to handle that case.
<<[[form]] definitions and data>>=
static STRING the_nl = {1,1,"\n"} ;
static STRING* const the_nl_str = &the_nl ;
@ %def the_nl_str
@
Function [[parse_spec()]] analyzes [["%...C"]], where [[C]] is
the terminating control character. On success, a pointer to past the
end of the [[Spec]] is returned and the
[[Spec]] is placed at the back of
a singly-linked list at [[tail]].
<<[[form]] definitions and data>>=
struct spec {
Spec* link ;
unsigned type ;
const STRING* prefix ;
int width ;
int prec ;
int minus_flag ;
unsigned ast_cnt ;
const char* form ;
} ;
@ %def Spec
<<[[printf]] functions>>=
const char* parse_spec(const char* str, const char* end, Spec* tail)
{
const char* const start = str-1 ;
Spec* spec = (Spec*)zmalloc(sizeof(Spec)) ;
spec->link = 0 ;
spec->width = WP_NONE ;
spec->prec = WP_NONE ;
spec->minus_flag = 0 ;
spec->ast_cnt = 0 ;
spec->form = 0 ;
unsigned l_cnt = 0 ;
<<do flags>>
<<do width and precision>>
<<count [['l']]>>
<<finish with the control character>>
tail->link = spec ;
return str+1 ;
}
@ %def parse_spec
@ %def l_cnt
<<static prototypes>>=
static const char* parse_spec(const char*, const char*, Spec*) ;
@
The [[width]] and [[prec]] can be an [[*]], [[WP_AST]],
or nothing, [[WP_NONE]], or a non-negative integer.
<<[[form]] definitions and data>>=
enum { WP_AST = -1, WP_NONE = -2 } ;
<<do flags>>=
{
while(str < end) {
switch(*str) {
case '-' :
spec->minus_flag = 1 ;
/* fall thru */
case '+' : case ' ' : case '#' : case '0' :
str++ ;
continue ;
default:
break ;
}
break ; /* while */
}
if (str == end) {
c_or_rt_error_or_silence(
"incomplete format specification \"%s\"", start) ;
<<[[return]] error>>
}
}
@
A null return indicates a misformed spec. We do not attempt to
recover allocated memory as the program will exit soon.
<<[[return]] error>>=
{
return 0 ;
}
<<do width and precision>>=
{
if (*str == '*') {
spec->width = WP_AST ;
spec->ast_cnt = 1 ;
str++ ;
}
else {
unsigned char c = *(unsigned char*) str ;
if (scan_code[c] == SC_DIGIT) {
spec->width = c - '0' ;
str++ ;
while(1) {
c = *(unsigned char*) str ;
if (scan_code[c] != SC_DIGIT) break ;
spec->width = spec->width * 10 + c - '0' ;
str++ ;
}
}
}
/* width is done */
if (*str == '.') {
/* have precision , no numbers will be prec 0 */
str++ ;
if (*str == '*') {
spec->prec = WP_AST ;
spec->ast_cnt++ ;
str++ ;
}
else {
unsigned char c ;
spec->prec = 0 ;
while(1) {
c = * (unsigned char*) str ;
if (scan_code[c] != SC_DIGIT) break ;
spec->prec = spec->prec * 10 + c - '0' ;
str++ ;
}
}
}
}
@
An [['l']] modifier is not necessary in [[awk]], but some awk's accept it and
earlier [[mawk]] did, so we accept it as long as followed by an integer
control character, [[d]], [[i]], etc.
<<count [['l']]>>=
{
while(*str == 'l') {
str++ ;
l_cnt++ ;
}
}
@
The next expected character is the control character and it determines
the type of the [[Spec]]. The types are,
\I[[PF_C]] print a character, [[%c]].
\I[[PF_I]] print a signed integer, [[%d]] or [[%i]].
\I[[PF_U]] print an unsigned integer, [[%u]], [[%x]], [[%X]] or [[%o]].
\I[[PF_F]] print a floating point number, [[%f]], [[%g]], [[%G]],
[[%e]] or [[%E]].
\I[[PF_S]] print a string, [[%s]].
\endhitems
<<[[form]] definitions and data>>=
enum { PF_C = 0, PF_I, PF_U, PF_F, PF_S } ;
@ %def PF_C PF_I PF_U PF_F PF_S
<<finish with the control character>>=
{
switch(*str) {
case 's':
spec->type = PF_S ;
break ;
case 'c':
case 'e': case 'g': case 'f': case 'E': case 'G':
<<make the [[spec]] type [[PF_F]] or type [[PF_C]]>>
break ;
case 'd': case 'i':
case 'o': case 'x': case 'X': case 'u':
<<make the [[spec]] type [[PF_I]] or type [[PF_U]]>>
break ;
default:
c_or_rt_error_or_silence(
"invalid control character '%c' in [s]printf format (\"%s\")",
*(unsigned char*) str, start) ;
<<[[return]] error>>
break ;
}
}
@
An [['l']] modifier does not make sense here, but rather than make it
an error, we silently remove it. This is a minor change in
[[mawk]] behavior.
<<make the [[spec]] type [[PF_F]] or type [[PF_C]]>>=
{
size_t len = str+1 - start - l_cnt ;
char* form = (char*) zmalloc(len+1) ;
spec->type = *str == 'c' ? PF_C : PF_F ;
memcpy(form, start, len-1) ;
form[len] = 0 ;
form[len-1] = *str ;
spec->form = form ;
}
@
A [[printf]] form such as [["%2x"]] in an [[awk]] program needs to
be converted to [["%2lx"]] for a call to the 64 bit long C-library
or [["%2llx"]] for the 32 bit long C-library. The user is allowed to use
[['l']] in an [[awk]] program, but it has no real effect.
<<make the [[spec]] type [[PF_I]] or type [[PF_U]]>>=
{
size_t len = str+1 - start ;
int delta = (have_long64? 1 : 2) - l_cnt ;
/* delta is number of 'l' to add or remove */
char* form ;
len += delta ;
form = (char*) zmalloc(len+1) ;
if (*str == 'd' || *str == 'i') {
spec->type = PF_I ;
}
else {
spec->type = PF_U ;
}
form[len] = 0 ;
form[len-1] = *str ;
form[len-2] = 'l' ;
if (!have_long64) {
form[len-3] = 'l' ;
}
memcpy(form, start, len - (have_long64?2:3)) ;
spec->form = form ;
}
@
\section{Output}
Up to the final output, to a file or copy to a string, the execution
of [[printf()]] and [[sprintf()]] is the same. Both start at
[[do_xprintf(fp,form,cp)]] with arguments,
\I[[fp]] is [[FILE*]] to the output file, if doing [[printf()]]. If doing
[[sprintf()]] is zero.
\I[[form]] is the [[Form*]] parsed from the format string.
\I[[cp]] points into an array of arguments. The number of arguments is
[[form->num_args]]. The [[CELL]] arguments can be modified, but
the caller owns the cells.
\endhitems
\noindent
If doing [[sprintf()]], the return is the [[STRING*]] output, else zero.
<<[[printf]] functions>>=
STRING* do_xprintf(
FILE* fp,
const Form* form,
CELL* cp)
{
const Spec* spec = form->specs ;
sprintf_ptr = string_buff ;
while(spec) {
if (spec->prefix) {
xprint_string(spec->prefix->str,spec->prefix->len,fp) ;
}
if (spec->type == PF_S) {
xprint_string_spec(fp,spec,cp) ;
}
else {
xprint_num_spec(fp,spec,cp) ;
}
cp += 1 + spec->ast_cnt ;
spec = spec->link ;
}
if (form->ending) {
xprint_string(form->ending->str, form->ending->len, fp) ;
}
if (fp) {
if (ferror(fp)) {
write_error(fp) ;
mawk_exit(2) ;
}
return 0 ;
}
return new_STRING2(string_buff, sprintf_ptr - string_buff) ;
}
@ %def do_xprintf
<<[[printf]] definitions>>=
STRING* do_xprintf(FILE*, const Form*, CELL*) ;
@
Here are two helper functions. The first outputs an array of characters
and the second outputs an array of spaces.
<<[[printf]] functions>>=
static void xprint_string(const char* str, size_t len, FILE* fp)
{
if (fp) {
fwrite(str, 1, len, fp) ;
}
else {
size_t room = string_buff_end - sprintf_ptr ;
while(room < len) {
sprintf_ptr = enlarge_string_buff(sprintf_ptr) ;
room = string_buff_end - sprintf_ptr ;
}
memcpy(sprintf_ptr, str, len) ;
sprintf_ptr += len ;
}
}
static void xprint_spaces(size_t len, FILE* fp)
{
char buffer[1024] ;
memset(buffer, ' ', len > 1024 ? 1024 : len) ;
while(len > 1024) {
xprint_string(buffer, 1024, fp) ;
len -= 1024 ;
}
xprint_string(buffer, len, fp) ;
}
@ %def xprint_string
@ %def xprint_spaces
<<static prototypes>>=
static void xprint_string(const char*,size_t,FILE*) ;
static void xprint_spaces(size_t,FILE*) ;
@
When outputting for [[sprintf()]] to [[string_buff]], the
place to write is [[sprintf_ptr]] ;
<<static data>>=
char* sprintf_ptr ;
@ %def sprintf_ptr
@
\subsection{Output for a [[%..s]] Specification}
This function outputs the [[STRING]] at [[cp]] using a
[[PF_S]] [[spec]]. Note that since the [[STRING]] might have
[[\0]], we do the implementation instead of passing it to
a C-library function.
<<[[printf]] functions>>=
static
void xprint_string_spec(FILE* fp, const Spec* spec, CELL* cp)
{
int width = spec->width ;
int prec = spec->prec ;
const char* str ;
size_t len ;
int minus_flag = spec->minus_flag ;
<<get [[width]] and [[prec]] for [[*]]>>
cast1_to_s(cp) ;
str = string(cp)->str ;
len = string(cp)->len ;
if (width < 0) width = 0 ; /* effectively ignore */
if (prec < 0) prec = len ; /* ditto */
if (prec < len) len = prec ;
/* output str and spaces if needed */
if (len >= width) {
xprint_string(str,len,fp) ;
}
else if (minus_flag) {
/* left justify */
xprint_string(str,len,fp) ;
xprint_spaces(width-len,fp) ;
}
else {
xprint_spaces(width-len,fp) ;
xprint_string(str,len,fp) ;
}
}
@ %def xprint_string_spec
<<static prototypes>>=
static void xprint_string_spec(FILE*,const Spec*,CELL*) ;
@
Here is a tricky point: for [[%*s]], if the value passed for [[*]] is
negative, e.g., [[-5]], then it is the same as passing [[5]] to
[[%-*s]].
<<get [[width]] and [[prec]] for [[*]]>>=
{
if (width == WP_AST) {
cast1_to_d(cp) ;
width = d_to_int(cp->dval) ;
if (width < 0) {
minus_flag = 1 ;
width = -width ;
}
cp++ ;
}
if (prec == WP_AST) {
cast1_to_d(cp) ;
prec = d_to_int(cp->dval) ;
cp++ ;
}
}
@
\subsection{Output for Numeric Specifications}
There are four numeric specifications.
The function,{\hfil\break}[[xprint_num_spec(fp,spec,cp)]] breaks the
output into the four cases, converting the data in [[*cp]] to
the appropriate type.
<<[[printf]] functions>>=
static
void xprint_num_spec(FILE* fp, const Spec* spec, CELL* cp)
{
unsigned ast_cnt = spec->ast_cnt ;
int ast[2] ;
<<set [[ast[2]]], incrementing [[cp]] as needed>>
switch(spec->type) {
case PF_F:
if (cp->type != C_DOUBLE) cast1_to_d(cp) ;
xprint_pf_f(fp, spec->form, ast_cnt, ast[0],ast[1],cp->dval) ;
break ;
case PF_I:
if (cp->type != C_DOUBLE) cast1_to_d(cp) ;
xprint_pf_i(fp, spec->form, ast_cnt, ast[0],ast[1],
d_to_i64(cp->dval)) ;
break ;
case PF_U:
if (cp->type != C_DOUBLE) cast1_to_d(cp) ;
xprint_pf_u(fp, spec->form, ast_cnt, ast[0],ast[1],
d_to_u64(cp->dval)) ;
break ;
case PF_C:
{
unsigned c ;
<<get the value of [[*cp]] into [[c]]>>
xprint_pf_c(fp, spec->form, ast_cnt, ast[0],ast[1],c) ;
}
break ;
}
}
@ %def print_spec
<<static prototypes>>=
static void xprint_num_spec(FILE*, const Spec*, CELL*) ;
@
Note the value assigned to [[*]] is supposed to be non-negative,
but we do not check as the C-library function will handle it.
<<set [[ast[2]]], incrementing [[cp]] as needed>>=
{
if (ast_cnt >= 1) {
cast1_to_d(cp) ;
ast[0] = d_to_int(cp->dval) ;
cp++ ;
}
if (ast_cnt == 2) {
cast1_to_d(cp) ;
ast[1] = d_to_int(cp->dval) ;
cp++ ;
}
}
@
[[%c]] is a little weird in [[awk]], for numeric values it uses the value,
but for string values, it uses the first character in the string or
zero for the empty string.
<<get the value of [[*cp]] into [[c]]>>=
{
int64_t val ;
if (cp->type == C_MBSTRN) {
check_strnum(cp) ;
}
if (cp->type == C_STRING) {
c = string(cp)->str[0] ;
}
else {
cast1_to_d(cp) ;
val = d_to_i64(cp->dval) ;
c = (unsigned) (val & 0xff) ;
}
}
@
If working in [[C++]], to get the four functions,
[[xprint_fp_{f,i,u,c}()]], we would write one template function and
instantiate it four times. Since we are working
in ansi [[C]], the following sub-sections are instantiation by
cut and paste.
\subsubsection{Floating Point Format}
<<[[printf]] functions>>=
static void xprint_pf_f(FILE* fp, const char* form,
unsigned cnt, int x, int y, double d)
{
if (fp) {
switch(cnt) {
case 0:
fprintf(fp, form, d) ;
break ;
case 1:
fprintf(fp, form, x, d) ;
break ;
case 2:
fprintf(fp, form, x, y, d) ;
break ;
}
}
else {
size_t room = string_buff_end - sprintf_ptr ;
size_t used = (size_t)-1 ;
while(1) {
switch(cnt) {
case 0:
used = snprintf(sprintf_ptr, room, form, d) ;
break ;
case 1:
used = snprintf(sprintf_ptr, room, form, x ,d) ;
break ;
case 2:
used = snprintf(sprintf_ptr, room, form, x,y,d) ;
break ;
}
if ((int) used < 0) snprintf_bozo() ;
if (used <= room) break ; /* while */
do {
sprintf_ptr = enlarge_string_buff(sprintf_ptr) ;
room = string_buff_end - sprintf_ptr ;
}
while(room < used) ;
}
sprintf_ptr += used ;
}
}
@ %def xprint_pf_f
<<static prototypes>>=
static void xprint_pf_f(FILE*,const char*,unsigned,int,int,double) ;
@
\subsubsection{Integer Format}
<<[[printf]] functions>>=
static void xprint_pf_i(FILE* fp, const char* form,
unsigned cnt, int x, int y, int64_t val)
{
if (fp) {
switch(cnt) {
case 0:
fprintf(fp, form, val) ;
break ;
case 1:
fprintf(fp, form, x, val) ;
break ;
case 2:
fprintf(fp, form, x, y, val) ;
break ;
}
}
else {
size_t room = string_buff_end - sprintf_ptr ;
size_t used = (size_t)-1 ;
while(1) {
switch(cnt) {
case 0:
used = snprintf(sprintf_ptr, room, form, val) ;
break ;
case 1:
used = snprintf(sprintf_ptr, room, form, x ,val) ;
break ;
case 2:
used = snprintf(sprintf_ptr, room, form, x,y,val) ;
break ;
}
if ((int) used < 0) snprintf_bozo() ;
if (used <= room) break ; /* while */
do {
sprintf_ptr = enlarge_string_buff(sprintf_ptr) ;
room = string_buff_end - sprintf_ptr ;
}
while(room < used) ;
}
sprintf_ptr += used ;
}
}
@ %def xprint_pf_i
<<static prototypes>>=
static void xprint_pf_i(FILE*,const char*,unsigned,int,int, int64_t) ;
@
\subsubsection{Unsigned Integer Format}
<<[[printf]] functions>>=
static void xprint_pf_u(FILE* fp, const char* form,
unsigned cnt, int x, int y, uint64_t val)
{
if (fp) {
switch(cnt) {
case 0:
fprintf(fp, form, val) ;
break ;
case 1:
fprintf(fp, form, x, val) ;
break ;
case 2:
fprintf(fp, form, x, y, val) ;
break ;
}
}
else {
size_t room = string_buff_end - sprintf_ptr ;
size_t used = (size_t)-1 ;
while(1) {
switch(cnt) {
case 0:
used = snprintf(sprintf_ptr, room, form, val) ;
break ;
case 1:
used = snprintf(sprintf_ptr, room, form, x ,val) ;
break ;
case 2:
used = snprintf(sprintf_ptr, room, form, x,y,val) ;
break ;
}
if ((int) used < 0) snprintf_bozo() ;
if (used <= room) break ; /* while */
do {
sprintf_ptr = enlarge_string_buff(sprintf_ptr) ;
room = string_buff_end - sprintf_ptr ;
}
while(room < used) ;
}
sprintf_ptr += used ;
}
}
@ %def xprint_pf_u
<<static prototypes>>=
static void xprint_pf_u(FILE*,const char*,unsigned,int,int, uint64_t) ;
@
\subsubsection{Single Character Format, [[%c]]}
Here the input, [[val]], is known to be in the range, [[[0,255)]].
<<[[printf]] functions>>=
static void xprint_pf_c(FILE* fp, const char* form,
unsigned cnt, int x, int y, unsigned val)
{
if (fp) {
switch(cnt) {
case 0:
fprintf(fp, form, val) ;
break ;
case 1:
fprintf(fp, form, x, val) ;
break ;
case 2:
fprintf(fp, form, x, y, val) ;
break ;
}
}
else {
size_t room = string_buff_end - sprintf_ptr ;
size_t used = (size_t)-1 ;
while(1) {
switch(cnt) {
case 0:
used = snprintf(sprintf_ptr, room, form, val) ;
break ;
case 1:
used = snprintf(sprintf_ptr, room, form, x ,val) ;
break ;
case 2:
used = snprintf(sprintf_ptr, room, form, x,y,val) ;
break ;
}
if ((int) used < 0) snprintf_bozo() ;
if (used <= room) break ; /* while */
do {
sprintf_ptr = enlarge_string_buff(sprintf_ptr) ;
room = string_buff_end - sprintf_ptr ;
}
while(room < used) ;
}
sprintf_ptr += used ;
}
}
@ %def xprint_pf_c
<<static prototypes>>=
static void xprint_pf_c(FILE*,const char*,unsigned,int,int, unsigned) ;
<<[[printf]] functions>>=
static void snprintf_bozo() {
rt_error("unexpected error (%d) in internal call to snprintf", errno) ;
/* no return */
}
@ %def snprintf_bozo
<<static prototypes>>=
static void snprintf_bozo(void) ;
@
\section{Loose Ends}
@
\subsection{[[Form]] Disassembly}
Here is support for [[-Wd]].
<<[[printf]] functions>>=
void visible_string(FILE*, const STRING*, int) ; /* in da.c */
static void da_Spec(FILE*, const Spec*) ;
void da_Form(FILE* fp, const Form* form)
{
const Spec* spec = form->specs ;
while(spec) {
da_Spec(fp,spec) ;
spec = spec->link ;
}
if (form->ending) {
visible_string(fp, form->ending,'\"') ;
}
}
@ %def da_Form
<<[[printf]] definitions>>=
void da_Form(FILE*,const Form*) ;
<<[[printf]] functions>>=
static void da_Spec(FILE* fp, const Spec* spec)
{
if (spec->prefix) visible_string(fp, spec->prefix, '\"') ;
if (spec->type != PF_S) {
fprintf(fp, "%s", spec->form) ;
}
else {
fputc('%', fp) ;
if (spec->minus_flag) fputc('-',fp) ;
if (spec->width == WP_AST) {
fputc('*',fp) ;
}
else if (spec->width >= 0) {
fprintf(fp, "%d", spec->width) ;
}
if (spec->prec >= 0) {
fprintf(fp, ".%d", spec->prec) ;
}
else if (spec->prec == WP_AST) {
fputs(".*", fp) ;
}
fputc('s', fp) ;
}
}
@ %def da_Spec
\subsection{Checking [[CONVFMT]]}
A bug report, against [[mawk]], reported a core-dump on bad assignment
to [[CONVFMT]]. The user is either careless or malicious, but we
will protect him/her by no longer allowing weird
assignment to [[CONVFMT]] or [[OFMT]].
This is a minor change in [[mawk]]'s behavior.