2
* Copyright Patrick Powell 1995
3
* This code is based on code written by Patrick Powell (papowell@astart.com)
4
* It may be used for any purpose as long as this notice remains intact
5
* on all source code distributions
8
/**************************************************************
10
* Patrick Powell Tue Apr 11 09:48:21 PDT 1995
11
* A bombproof version of doprnt (dopr) included.
12
* Sigh. This sort of thing is always nasty do deal with. Note that
13
* the version here does not include floating point...
15
* snprintf() is used instead of sprintf() as it does limit checks
16
* for string length. This covers a nasty loophole.
18
* The other functions are there to prevent NULL pointers from
19
* causing nast effects.
22
* Brandon Long <blong@fiction.net> 9/15/96 for mutt 0.43
23
* This was ugly. It is still ugly. I opted out of floating point
24
* numbers, but the formatter understands just about everything
25
* from the normal C string format, at least as far as I can tell from
26
* the Solaris 2.5 printf(3S) man page.
28
* Brandon Long <blong@fiction.net> 10/22/97 for mutt 0.87.1
29
* Ok, added some minimal floating point support, which means this
30
* probably requires libm on most operating systems. Don't yet
31
* support the exponent (e,E) and sigfig (g,G). Also, fmtint()
32
* was pretty badly broken, it just wasn't being exercised in ways
33
* which showed it, so that's been fixed. Also, formated the code
34
* to mutt conventions, and removed dead code left over from the
35
* original. Also, there is now a builtin-test, just compile with:
36
* gcc -DTEST_SNPRINTF -o snprintf snprintf.c -lm
37
* and run snprintf for results.
39
* Thomas Roessler <roessler@guug.de> 01/27/98 for mutt 0.89i
40
* The PGP code was using unsigned hexadecimal formats.
41
* Unfortunately, unsigned formats simply didn't work.
43
* Michael Elkins <me@cs.hmc.edu> 03/05/98 for mutt 0.90.8
44
* The original code assumed that both snprintf() and vsnprintf() were
45
* missing. Some systems only have snprintf() but not vsnprintf(), so
46
* the code is now broken down under HAVE_SNPRINTF and HAVE_VSNPRINTF.
48
* Andrew Tridgell (tridge@samba.org) Oct 1998
49
* fixed handling of %.0f
50
* added test for HAVE_LONG_DOUBLE
52
* tridge@samba.org, idra@samba.org, April 2001
53
* got rid of fcvt code (twas buggy and made testing harder)
56
**************************************************************/
58
#ifndef NO_CONFIG_H /* for some tests */
72
#include <sys/types.h>
78
#if defined(HAVE_SNPRINTF) && defined(HAVE_VSNPRINTF) && defined(HAVE_C99_VSNPRINTF)
79
/* only include stdio.h if we are not re-defining snprintf or vsnprintf */
81
/* make the compiler happy with an empty file */
82
void dummy_snprintf(void) {}
85
#ifdef HAVE_LONG_DOUBLE
86
#define LDOUBLE long double
88
#define LDOUBLE double
92
#define LLONG long long
97
static size_t dopr(char *buffer, size_t maxlen, const char *format,
99
static void fmtstr(char *buffer, size_t *currlen, size_t maxlen,
100
char *value, int flags, int min, int max);
101
static void fmtint(char *buffer, size_t *currlen, size_t maxlen,
102
long value, int base, int min, int max, int flags);
103
static void fmtfp(char *buffer, size_t *currlen, size_t maxlen,
104
LDOUBLE fvalue, int min, int max, int flags);
105
static void dopr_outch(char *buffer, size_t *currlen, size_t maxlen, char c);
108
* dopr(): poor man's version of doprintf
111
/* format read states */
112
#define DP_S_DEFAULT 0
121
/* format flags - Bits */
122
#define DP_F_MINUS (1 << 0)
123
#define DP_F_PLUS (1 << 1)
124
#define DP_F_SPACE (1 << 2)
125
#define DP_F_NUM (1 << 3)
126
#define DP_F_ZERO (1 << 4)
127
#define DP_F_UP (1 << 5)
128
#define DP_F_UNSIGNED (1 << 6)
130
/* Conversion Flags */
133
#define DP_C_LDOUBLE 3
136
#define char_to_int(p) ((p)- '0')
138
#define MAX(p,q) (((p) >= (q)) ? (p) : (q))
141
static size_t dopr(char *buffer, size_t maxlen, const char *format, va_list args)
154
state = DP_S_DEFAULT;
155
currlen = flags = cflags = min = 0;
159
while (state != DP_S_DONE) {
168
dopr_outch (buffer, &currlen, maxlen, ch);
199
if (isdigit((unsigned char)ch)) {
200
min = 10*min + char_to_int (ch);
202
} else if (ch == '*') {
203
min = va_arg (args, int);
219
if (isdigit((unsigned char)ch)) {
222
max = 10*max + char_to_int (ch);
224
} else if (ch == '*') {
225
max = va_arg (args, int);
241
if (ch == 'l') { /* It's a long long */
247
cflags = DP_C_LDOUBLE;
259
if (cflags == DP_C_SHORT)
260
value = va_arg (args, int);
261
else if (cflags == DP_C_LONG)
262
value = va_arg (args, long int);
263
else if (cflags == DP_C_LLONG)
264
value = va_arg (args, LLONG);
266
value = va_arg (args, int);
267
fmtint (buffer, &currlen, maxlen, value, 10, min, max, flags);
270
flags |= DP_F_UNSIGNED;
271
if (cflags == DP_C_SHORT)
272
value = va_arg (args, unsigned int);
273
else if (cflags == DP_C_LONG)
274
value = (long)va_arg (args, unsigned long int);
275
else if (cflags == DP_C_LLONG)
276
value = (long)va_arg (args, unsigned LLONG);
278
value = (long)va_arg (args, unsigned int);
279
fmtint (buffer, &currlen, maxlen, value, 8, min, max, flags);
282
flags |= DP_F_UNSIGNED;
283
if (cflags == DP_C_SHORT)
284
value = va_arg (args, unsigned int);
285
else if (cflags == DP_C_LONG)
286
value = (long)va_arg (args, unsigned long int);
287
else if (cflags == DP_C_LLONG)
288
value = (LLONG)va_arg (args, unsigned LLONG);
290
value = (long)va_arg (args, unsigned int);
291
fmtint (buffer, &currlen, maxlen, value, 10, min, max, flags);
296
flags |= DP_F_UNSIGNED;
297
if (cflags == DP_C_SHORT)
298
value = va_arg (args, unsigned int);
299
else if (cflags == DP_C_LONG)
300
value = (long)va_arg (args, unsigned long int);
301
else if (cflags == DP_C_LLONG)
302
value = (LLONG)va_arg (args, unsigned LLONG);
304
value = (long)va_arg (args, unsigned int);
305
fmtint (buffer, &currlen, maxlen, value, 16, min, max, flags);
308
if (cflags == DP_C_LDOUBLE)
309
fvalue = va_arg (args, LDOUBLE);
311
fvalue = va_arg (args, double);
312
/* um, floating point? */
313
fmtfp (buffer, &currlen, maxlen, fvalue, min, max, flags);
318
if (cflags == DP_C_LDOUBLE)
319
fvalue = va_arg (args, LDOUBLE);
321
fvalue = va_arg (args, double);
326
if (cflags == DP_C_LDOUBLE)
327
fvalue = va_arg (args, LDOUBLE);
329
fvalue = va_arg (args, double);
332
dopr_outch (buffer, &currlen, maxlen, va_arg (args, int));
335
strvalue = va_arg (args, char *);
337
max = strlen(strvalue);
339
if (min > 0 && max >= 0 && min > max) max = min;
340
fmtstr (buffer, &currlen, maxlen, strvalue, flags, min, max);
343
strvalue = va_arg (args, void *);
344
fmtint (buffer, &currlen, maxlen, (long) strvalue, 16, min, max, flags);
347
if (cflags == DP_C_SHORT) {
349
num = va_arg (args, short int *);
351
} else if (cflags == DP_C_LONG) {
353
num = va_arg (args, long int *);
354
*num = (long int)currlen;
355
} else if (cflags == DP_C_LLONG) {
357
num = va_arg (args, LLONG *);
358
*num = (LLONG)currlen;
361
num = va_arg (args, int *);
366
dopr_outch (buffer, &currlen, maxlen, ch);
369
/* not supported yet, treat as next char */
377
state = DP_S_DEFAULT;
378
flags = cflags = min = 0;
385
break; /* some picky compilers need this */
389
if (currlen < maxlen - 1)
390
buffer[currlen] = '\0';
392
buffer[maxlen - 1] = '\0';
398
static void fmtstr(char *buffer, size_t *currlen, size_t maxlen,
399
char *value, int flags, int min, int max)
401
int padlen, strln; /* amount to pad */
404
#ifdef DEBUG_SNPRINTF
405
printf("fmtstr min=%d max=%d s=[%s]\n", min, max, value);
411
for (strln = 0; value[strln]; ++strln); /* strlen */
412
padlen = min - strln;
415
if (flags & DP_F_MINUS)
416
padlen = -padlen; /* Left Justify */
418
while ((padlen > 0) && (cnt < max)) {
419
dopr_outch (buffer, currlen, maxlen, ' ');
423
while (*value && (cnt < max)) {
424
dopr_outch (buffer, currlen, maxlen, *value++);
427
while ((padlen < 0) && (cnt < max)) {
428
dopr_outch (buffer, currlen, maxlen, ' ');
434
/* Have to handle DP_F_NUM (ie 0x and 0 alternates) */
436
static void fmtint(char *buffer, size_t *currlen, size_t maxlen,
437
long value, int base, int min, int max, int flags)
440
unsigned long uvalue;
443
int spadlen = 0; /* amount to space pad */
444
int zpadlen = 0; /* amount to zero pad */
452
if(!(flags & DP_F_UNSIGNED)) {
457
if (flags & DP_F_PLUS) /* Do a sign (+/i) */
459
else if (flags & DP_F_SPACE)
464
if (flags & DP_F_UP) caps = 1; /* Should characters be upper case? */
468
(caps? "0123456789ABCDEF":"0123456789abcdef")
469
[uvalue % (unsigned)base ];
470
uvalue = (uvalue / (unsigned)base );
471
} while(uvalue && (place < 20));
472
if (place == 20) place--;
475
zpadlen = max - place;
476
spadlen = min - MAX (max, place) - (signvalue ? 1 : 0);
477
if (zpadlen < 0) zpadlen = 0;
478
if (spadlen < 0) spadlen = 0;
479
if (flags & DP_F_ZERO) {
480
zpadlen = MAX(zpadlen, spadlen);
483
if (flags & DP_F_MINUS)
484
spadlen = -spadlen; /* Left Justifty */
486
#ifdef DEBUG_SNPRINTF
487
printf("zpad: %d, spad: %d, min: %d, max: %d, place: %d\n",
488
zpadlen, spadlen, min, max, place);
492
while (spadlen > 0) {
493
dopr_outch (buffer, currlen, maxlen, ' ');
499
dopr_outch (buffer, currlen, maxlen, signvalue);
503
while (zpadlen > 0) {
504
dopr_outch (buffer, currlen, maxlen, '0');
511
dopr_outch (buffer, currlen, maxlen, convert[--place]);
513
/* Left Justified spaces */
514
while (spadlen < 0) {
515
dopr_outch (buffer, currlen, maxlen, ' ');
520
static LDOUBLE abs_val(LDOUBLE value)
522
LDOUBLE result = value;
530
static LDOUBLE POW10(int exp)
542
static LLONG ROUND(LDOUBLE value)
546
intpart = (LLONG)value;
547
value = value - intpart;
548
if (value >= 0.5) intpart++;
553
/* a replacement for modf that doesn't need the math library. Should
554
be portable, but slow */
555
static double my_modf(double x0, double *iptr)
562
for (i=0;i<100;i++) {
564
if (l <= (x+1) && l >= (x-1)) break;
570
/* yikes! the number is beyond what we can handle. What do we do? */
579
ret = my_modf(x0-l*f, &i2);
589
static void fmtfp (char *buffer, size_t *currlen, size_t maxlen,
590
LDOUBLE fvalue, int min, int max, int flags)
598
int padlen = 0; /* amount to pad */
607
* AIX manpage says the default is 0, but Solaris says the default
608
* is 6, and sprintf on AIX defaults to 6
613
ufvalue = abs_val (fvalue);
618
if (flags & DP_F_PLUS) { /* Do a sign (+/i) */
621
if (flags & DP_F_SPACE)
627
if (flags & DP_F_UP) caps = 1; /* Should characters be upper case? */
631
if (max == 0) ufvalue += 0.5; /* if max = 0 we must round */
635
* Sorry, we only support 16 digits past the decimal because of our
641
/* We "cheat" by converting the fractional part to integer by
642
* multiplying by a factor of 10
646
my_modf(temp, &intpart);
648
fracpart = ROUND((POW10(max)) * (ufvalue - intpart));
650
if (fracpart >= POW10(max)) {
652
fracpart -= POW10(max);
656
/* Convert integer part */
659
my_modf(intpart*0.1, &intpart);
661
index = (int) ((temp -intpart +0.05)* 10.0);
662
/* index = (int) (((double)(temp*0.1) -intpart +0.05) *10.0); */
663
/* printf ("%llf, %f, %x\n", temp, intpart, index); */
665
(caps? "0123456789ABCDEF":"0123456789abcdef")[index];
666
} while (intpart && (iplace < 311));
667
if (iplace == 311) iplace--;
668
iconvert[iplace] = 0;
670
/* Convert fractional part */
675
my_modf(fracpart*0.1, &fracpart);
677
index = (int) ((temp -fracpart +0.05)* 10.0);
678
/* index = (int) ((((temp/10) -fracpart) +0.05) *10); */
679
/* printf ("%lf, %lf, %ld\n", temp, fracpart, index); */
681
(caps? "0123456789ABCDEF":"0123456789abcdef")[index];
682
} while(fracpart && (fplace < 311));
683
if (fplace == 311) fplace--;
685
fconvert[fplace] = 0;
687
/* -1 for decimal point, another -1 if we are printing a sign */
688
padlen = min - iplace - max - 1 - ((signvalue) ? 1 : 0);
689
zpadlen = max - fplace;
690
if (zpadlen < 0) zpadlen = 0;
693
if (flags & DP_F_MINUS)
694
padlen = -padlen; /* Left Justifty */
696
if ((flags & DP_F_ZERO) && (padlen > 0)) {
698
dopr_outch (buffer, currlen, maxlen, signvalue);
703
dopr_outch (buffer, currlen, maxlen, '0');
708
dopr_outch (buffer, currlen, maxlen, ' ');
712
dopr_outch (buffer, currlen, maxlen, signvalue);
715
dopr_outch (buffer, currlen, maxlen, iconvert[--iplace]);
717
#ifdef DEBUG_SNPRINTF
718
printf("fmtfp: fplace=%d zpadlen=%d\n", fplace, zpadlen);
722
* Decimal point. This should probably use locale to find the correct
726
dopr_outch (buffer, currlen, maxlen, '.');
729
dopr_outch (buffer, currlen, maxlen, fconvert[--fplace]);
732
while (zpadlen > 0) {
733
dopr_outch (buffer, currlen, maxlen, '0');
738
dopr_outch (buffer, currlen, maxlen, ' ');
743
static void dopr_outch(char *buffer, size_t *currlen, size_t maxlen, char c)
745
if (*currlen < maxlen) {
746
buffer[(*currlen)] = c;
751
#if !defined(HAVE_VSNPRINTF) || !defined(HAVE_C99_VSNPRINTF)
752
int vsnprintf (char *str, size_t count, const char *fmt, va_list args)
754
return dopr(str, count, fmt, args);
758
#if !defined(HAVE_SNPRINTF) || !defined(HAVE_C99_VSNPRINTF)
759
int snprintf(char *str,size_t count,const char *fmt,...)
765
ret = vsnprintf(str, count, fmt, ap);
773
#ifndef HAVE_VASPRINTF
774
int vasprintf(char **ptr, const char *format, va_list ap)
778
ret = vsnprintf(NULL, 0, format, ap);
779
if (ret <= 0) return ret;
781
(*ptr) = (char *)malloc(ret+1);
782
if (!*ptr) return -1;
783
ret = vsnprintf(*ptr, ret+1, format, ap);
790
#ifndef HAVE_ASPRINTF
791
int asprintf(char **ptr, const char *format, ...)
796
va_start(ap, format);
797
ret = vasprintf(ptr, format, ap);
806
int sprintf(char *str,const char *fmt,...);
830
double fp_nums[] = { 6442452944.1234, -1.5, 134.21, 91340.2, 341.1234, 0203.9, 0.96, 0.996,
831
0.9996, 1.996, 4.136, 0};
845
long int_nums[] = { -1, 134, 91340, 341, 0203, 0};
859
char *str_vals[] = {"hello", "a", "", "a longer string", NULL};
864
printf ("Testing snprintf format codes against system sprintf...\n");
866
for (x = 0; fp_fmt[x] ; x++) {
867
for (y = 0; fp_nums[y] != 0 ; y++) {
868
int l1 = snprintf(NULL, 0, fp_fmt[x], fp_nums[y]);
869
int l2 = snprintf(buf1, sizeof(buf1), fp_fmt[x], fp_nums[y]);
870
sprintf (buf2, fp_fmt[x], fp_nums[y]);
871
if (strcmp (buf1, buf2)) {
872
printf("snprintf doesn't match Format: %s\n\tsnprintf = [%s]\n\t sprintf = [%s]\n",
873
fp_fmt[x], buf1, buf2);
877
printf("snprintf l1 != l2 (%d %d) %s\n", l1, l2, fp_fmt[x]);
884
for (x = 0; int_fmt[x] ; x++) {
885
for (y = 0; int_nums[y] != 0 ; y++) {
886
int l1 = snprintf(NULL, 0, int_fmt[x], int_nums[y]);
887
int l2 = snprintf(buf1, sizeof(buf1), int_fmt[x], int_nums[y]);
888
sprintf (buf2, int_fmt[x], int_nums[y]);
889
if (strcmp (buf1, buf2)) {
890
printf("snprintf doesn't match Format: %s\n\tsnprintf = [%s]\n\t sprintf = [%s]\n",
891
int_fmt[x], buf1, buf2);
895
printf("snprintf l1 != l2 (%d %d) %s\n", l1, l2, int_fmt[x]);
902
for (x = 0; str_fmt[x] ; x++) {
903
for (y = 0; str_vals[y] != 0 ; y++) {
904
int l1 = snprintf(NULL, 0, str_fmt[x], str_vals[y]);
905
int l2 = snprintf(buf1, sizeof(buf1), str_fmt[x], str_vals[y]);
906
sprintf (buf2, str_fmt[x], str_vals[y]);
907
if (strcmp (buf1, buf2)) {
908
printf("snprintf doesn't match Format: %s\n\tsnprintf = [%s]\n\t sprintf = [%s]\n",
909
str_fmt[x], buf1, buf2);
913
printf("snprintf l1 != l2 (%d %d) %s\n", l1, l2, str_fmt[x]);
920
printf ("%d tests failed out of %d.\n", fail, num);
922
printf("seeing how many digits we support\n");
924
double v0 = 0.12345678901234567890123456789012345678901;
925
for (x=0; x<100; x++) {
926
snprintf(buf1, sizeof(buf1), "%1.1f", v0*pow(10, x));
927
sprintf(buf2, "%1.1f", v0*pow(10, x));
928
if (strcmp(buf1, buf2)) {
929
printf("we seem to support %d digits\n", x-1);
937
#endif /* SNPRINTF_TEST */
added
removed
WINGs/snprintf.c
