/* * Copyright Patrick Powell 1995 * This code is based on code written by Patrick Powell (papowell@astart.com) * It may be used for any purpose as long as this notice remains intact * on all source code distributions */ /************************************************************** * Original: * Patrick Powell Tue Apr 11 09:48:21 PDT 1995 * A bombproof version of doprnt (dopr) included. * Sigh. This sort of thing is always nasty do deal with. Note that * the version here does not include floating point... * * snprintf() is used instead of sprintf() as it does limit checks * for string length. This covers a nasty loophole. * * The other functions are there to prevent NULL pointers from * causing nast effects. * * More Recently: * Brandon Long 9/15/96 for mutt 0.43 * This was ugly. It is still ugly. I opted out of floating point * numbers, but the formatter understands just about everything * from the normal C string format, at least as far as I can tell from * the Solaris 2.5 printf(3S) man page. * * Brandon Long 10/22/97 for mutt 0.87.1 * Ok, added some minimal floating point support, which means this * probably requires libm on most operating systems. Don't yet * support the exponent (e,E) and sigfig (g,G). Also, fmtint() * was pretty badly broken, it just wasn't being exercised in ways * which showed it, so that's been fixed. Also, formated the code * to mutt conventions, and removed dead code left over from the * original. Also, there is now a builtin-test, just compile with: * gcc -DTEST_SNPRINTF -o snprintf snprintf.c -lm * and run snprintf for results. * * Thomas Roessler 01/27/98 for mutt 0.89i * The PGP code was using unsigned hexadecimal formats. * Unfortunately, unsigned formats simply didn't work. * * Michael Elkins 03/05/98 for mutt 0.90.8 * The original code assumed that both snprintf() and vsnprintf() were * missing. Some systems only have snprintf() but not vsnprintf(), so * the code is now broken down under HAVE_SNPRINTF and HAVE_VSNPRINTF. * * Andrew Tridgell (tridge@samba.org) Oct 1998 * fixed handling of %.0f * added test for HAVE_LONG_DOUBLE * * tridge@samba.org, idra@samba.org, April 2001 * got rid of fcvt code (twas buggy and made testing harder) * added C99 semantics * **************************************************************/ #ifndef NO_CONFIG_H /* for some tests */ #include "config.h" #else #define NULL 0 #endif #ifdef TEST_SNPRINTF /* need math library headers for testing */ #include #endif #ifdef HAVE_STRING_H #include #endif #ifdef HAVE_STRINGS_H #include #endif #ifdef HAVE_CTYPE_H #include #endif #include #include #ifdef HAVE_STDLIB_H #include #endif #if defined(HAVE_SNPRINTF) && defined(HAVE_VSNPRINTF) && defined(HAVE_C99_VSNPRINTF) /* only include stdio.h if we are not re-defining snprintf or vsnprintf */ #include /* make the compiler happy with an empty file */ void dummy_snprintf(void) {} #else #ifdef HAVE_LONG_DOUBLE #define LDOUBLE long double #else #define LDOUBLE double #endif #ifdef HAVE_LONG_LONG #define LLONG long long #else #define LLONG long #endif /* free memory if the pointer is valid and zero the pointer */ #ifndef SAFE_FREE #define SAFE_FREE(x) do { if ((x) != NULL) {free((x)); (x)=NULL;} } while(0) #endif #ifndef VA_COPY #ifdef HAVE_VA_COPY #define VA_COPY(dest, src) __va_copy(dest, src) #else #define VA_COPY(dest, src) (dest) = (src) #endif #endif static size_t dopr(char *buffer, size_t maxlen, const char *format, va_list args_in); static void fmtstr(char *buffer, size_t *currlen, size_t maxlen, char *value, int flags, int min, int max); static void fmtint(char *buffer, size_t *currlen, size_t maxlen, long value, int base, int min, int max, int flags); static void fmtfp(char *buffer, size_t *currlen, size_t maxlen, LDOUBLE fvalue, int min, int max, int flags); static void dopr_outch(char *buffer, size_t *currlen, size_t maxlen, char c); /* * dopr(): poor man's version of doprintf */ /* format read states */ #define DP_S_DEFAULT 0 #define DP_S_FLAGS 1 #define DP_S_MIN 2 #define DP_S_DOT 3 #define DP_S_MAX 4 #define DP_S_MOD 5 #define DP_S_CONV 6 #define DP_S_DONE 7 /* format flags - Bits */ #define DP_F_MINUS (1 << 0) #define DP_F_PLUS (1 << 1) #define DP_F_SPACE (1 << 2) #define DP_F_NUM (1 << 3) #define DP_F_ZERO (1 << 4) #define DP_F_UP (1 << 5) #define DP_F_UNSIGNED (1 << 6) /* Conversion Flags */ #define DP_C_SHORT 1 #define DP_C_LONG 2 #define DP_C_LDOUBLE 3 #define DP_C_LLONG 4 #define char_to_int(p) ((p)- '0') #ifndef MAX #define MAX(p,q) (((p) >= (q)) ? (p) : (q)) #endif static size_t dopr(char *buffer, size_t maxlen, const char *format, va_list args_in) { char ch; LLONG value; LDOUBLE fvalue; char *strvalue; int min; int max; int state; int flags; int cflags; size_t currlen; va_list args; VA_COPY(args, args_in); state = DP_S_DEFAULT; currlen = flags = cflags = min = 0; max = -1; ch = *format++; while (state != DP_S_DONE) { if (ch == '\0') state = DP_S_DONE; switch(state) { case DP_S_DEFAULT: if (ch == '%') state = DP_S_FLAGS; else dopr_outch (buffer, &currlen, maxlen, ch); ch = *format++; break; case DP_S_FLAGS: switch (ch) { case '-': flags |= DP_F_MINUS; ch = *format++; break; case '+': flags |= DP_F_PLUS; ch = *format++; break; case ' ': flags |= DP_F_SPACE; ch = *format++; break; case '#': flags |= DP_F_NUM; ch = *format++; break; case '0': flags |= DP_F_ZERO; ch = *format++; break; default: state = DP_S_MIN; break; } break; case DP_S_MIN: if (isdigit((unsigned char)ch)) { min = 10*min + char_to_int (ch); ch = *format++; } else if (ch == '*') { min = va_arg (args, int); ch = *format++; state = DP_S_DOT; } else { state = DP_S_DOT; } break; case DP_S_DOT: if (ch == '.') { state = DP_S_MAX; ch = *format++; } else { state = DP_S_MOD; } break; case DP_S_MAX: if (isdigit((unsigned char)ch)) { if (max < 0) max = 0; max = 10*max + char_to_int (ch); ch = *format++; } else if (ch == '*') { max = va_arg (args, int); ch = *format++; state = DP_S_MOD; } else { state = DP_S_MOD; } break; case DP_S_MOD: switch (ch) { case 'h': cflags = DP_C_SHORT; ch = *format++; break; case 'l': cflags = DP_C_LONG; ch = *format++; if (ch == 'l') { /* It's a long long */ cflags = DP_C_LLONG; ch = *format++; } break; case 'L': cflags = DP_C_LDOUBLE; ch = *format++; break; default: break; } state = DP_S_CONV; break; case DP_S_CONV: switch (ch) { case 'd': case 'i': if (cflags == DP_C_SHORT) value = va_arg (args, int); else if (cflags == DP_C_LONG) value = va_arg (args, long int); else if (cflags == DP_C_LLONG) value = va_arg (args, LLONG); else value = va_arg (args, int); fmtint (buffer, &currlen, maxlen, value, 10, min, max, flags); break; case 'o': flags |= DP_F_UNSIGNED; if (cflags == DP_C_SHORT) value = va_arg (args, unsigned int); else if (cflags == DP_C_LONG) value = (long)va_arg (args, unsigned long int); else if (cflags == DP_C_LLONG) value = (long)va_arg (args, unsigned LLONG); else value = (long)va_arg (args, unsigned int); fmtint (buffer, &currlen, maxlen, value, 8, min, max, flags); break; case 'u': flags |= DP_F_UNSIGNED; if (cflags == DP_C_SHORT) value = va_arg (args, unsigned int); else if (cflags == DP_C_LONG) value = (long)va_arg (args, unsigned long int); else if (cflags == DP_C_LLONG) value = (LLONG)va_arg (args, unsigned LLONG); else value = (long)va_arg (args, unsigned int); fmtint (buffer, &currlen, maxlen, value, 10, min, max, flags); break; case 'X': flags |= DP_F_UP; case 'x': flags |= DP_F_UNSIGNED; if (cflags == DP_C_SHORT) value = va_arg (args, unsigned int); else if (cflags == DP_C_LONG) value = (long)va_arg (args, unsigned long int); else if (cflags == DP_C_LLONG) value = (LLONG)va_arg (args, unsigned LLONG); else value = (long)va_arg (args, unsigned int); fmtint (buffer, &currlen, maxlen, value, 16, min, max, flags); break; case 'f': if (cflags == DP_C_LDOUBLE) fvalue = va_arg (args, LDOUBLE); else fvalue = va_arg (args, double); /* um, floating point? */ fmtfp (buffer, &currlen, maxlen, fvalue, min, max, flags); break; case 'E': flags |= DP_F_UP; case 'e': if (cflags == DP_C_LDOUBLE) fvalue = va_arg (args, LDOUBLE); else fvalue = va_arg (args, double); fmtfp (buffer, &currlen, maxlen, fvalue, min, max, flags); break; case 'G': flags |= DP_F_UP; case 'g': if (cflags == DP_C_LDOUBLE) fvalue = va_arg (args, LDOUBLE); else fvalue = va_arg (args, double); fmtfp (buffer, &currlen, maxlen, fvalue, min, max, flags); break; case 'c': dopr_outch (buffer, &currlen, maxlen, va_arg (args, int)); break; case 's': strvalue = va_arg (args, char *); if (!strvalue) strvalue = "(NULL)"; if (max == -1) { max = strlen(strvalue); } if (min > 0 && max >= 0 && min > max) max = min; fmtstr (buffer, &currlen, maxlen, strvalue, flags, min, max); break; case 'p': strvalue = va_arg (args, void *); fmtint (buffer, &currlen, maxlen, (long) strvalue, 16, min, max, flags); break; case 'n': if (cflags == DP_C_SHORT) { short int *num; num = va_arg (args, short int *); *num = currlen; } else if (cflags == DP_C_LONG) { long int *num; num = va_arg (args, long int *); *num = (long int)currlen; } else if (cflags == DP_C_LLONG) { LLONG *num; num = va_arg (args, LLONG *); *num = (LLONG)currlen; } else { int *num; num = va_arg (args, int *); *num = currlen; } break; case '%': dopr_outch (buffer, &currlen, maxlen, ch); break; case 'w': /* not supported yet, treat as next char */ ch = *format++; break; default: /* Unknown, skip */ break; } ch = *format++; state = DP_S_DEFAULT; flags = cflags = min = 0; max = -1; break; case DP_S_DONE: break; default: /* hmm? */ break; /* some picky compilers need this */ } } if (maxlen != 0) { if (currlen < maxlen - 1) buffer[currlen] = '\0'; else if (maxlen > 0) buffer[maxlen - 1] = '\0'; } return currlen; } static void fmtstr(char *buffer, size_t *currlen, size_t maxlen, char *value, int flags, int min, int max) { int padlen, strln; /* amount to pad */ int cnt = 0; #ifdef DEBUG_SNPRINTF printf("fmtstr min=%d max=%d s=[%s]\n", min, max, value); #endif if (value == 0) { value = ""; } for (strln = 0; value[strln]; ++strln); /* strlen */ padlen = min - strln; if (padlen < 0) padlen = 0; if (flags & DP_F_MINUS) padlen = -padlen; /* Left Justify */ while ((padlen > 0) && (cnt < max)) { dopr_outch (buffer, currlen, maxlen, ' '); --padlen; ++cnt; } while (*value && (cnt < max)) { dopr_outch (buffer, currlen, maxlen, *value++); ++cnt; } while ((padlen < 0) && (cnt < max)) { dopr_outch (buffer, currlen, maxlen, ' '); ++padlen; ++cnt; } } /* Have to handle DP_F_NUM (ie 0x and 0 alternates) */ static void fmtint(char *buffer, size_t *currlen, size_t maxlen, long value, int base, int min, int max, int flags) { int signvalue = 0; unsigned long uvalue; char convert[20]; int place = 0; int spadlen = 0; /* amount to space pad */ int zpadlen = 0; /* amount to zero pad */ int caps = 0; if (max < 0) max = 0; uvalue = value; if(!(flags & DP_F_UNSIGNED)) { if( value < 0 ) { signvalue = '-'; uvalue = -value; } else { if (flags & DP_F_PLUS) /* Do a sign (+/i) */ signvalue = '+'; else if (flags & DP_F_SPACE) signvalue = ' '; } } if (flags & DP_F_UP) caps = 1; /* Should characters be upper case? */ do { convert[place++] = (caps? "0123456789ABCDEF":"0123456789abcdef") [uvalue % (unsigned)base ]; uvalue = (uvalue / (unsigned)base ); } while(uvalue && (place < 20)); if (place == 20) place--; convert[place] = 0; zpadlen = max - place; spadlen = min - MAX (max, place) - (signvalue ? 1 : 0); if (zpadlen < 0) zpadlen = 0; if (spadlen < 0) spadlen = 0; if (flags & DP_F_ZERO) { zpadlen = MAX(zpadlen, spadlen); spadlen = 0; } if (flags & DP_F_MINUS) spadlen = -spadlen; /* Left Justifty */ #ifdef DEBUG_SNPRINTF printf("zpad: %d, spad: %d, min: %d, max: %d, place: %d\n", zpadlen, spadlen, min, max, place); #endif /* Spaces */ while (spadlen > 0) { dopr_outch (buffer, currlen, maxlen, ' '); --spadlen; } /* Sign */ if (signvalue) dopr_outch (buffer, currlen, maxlen, signvalue); /* Zeros */ if (zpadlen > 0) { while (zpadlen > 0) { dopr_outch (buffer, currlen, maxlen, '0'); --zpadlen; } } /* Digits */ while (place > 0) dopr_outch (buffer, currlen, maxlen, convert[--place]); /* Left Justified spaces */ while (spadlen < 0) { dopr_outch (buffer, currlen, maxlen, ' '); ++spadlen; } } static LDOUBLE abs_val(LDOUBLE value) { LDOUBLE result = value; if (value < 0) result = -value; return result; } static LDOUBLE POW10(int exp) { LDOUBLE result = 1; while (exp) { result *= 10; exp--; } return result; } static LLONG ROUND(LDOUBLE value) { LLONG intpart; intpart = (LLONG)value; value = value - intpart; if (value >= 0.5) intpart++; return intpart; } /* a replacement for modf that doesn't need the math library. Should be portable, but slow */ static double my_modf(double x0, double *iptr) { int i; long l; double x = x0; double f = 1.0; for (i=0;i<100;i++) { l = (long)x; if (l <= (x+1) && l >= (x-1)) break; x *= 0.1; f *= 10.0; } if (i == 100) { /* yikes! the number is beyond what we can handle. What do we do? */ (*iptr) = 0; return 0; } if (i != 0) { double i2; double ret; ret = my_modf(x0-l*f, &i2); (*iptr) = l*f + i2; return ret; } (*iptr) = l; return x - (*iptr); } static void fmtfp (char *buffer, size_t *currlen, size_t maxlen, LDOUBLE fvalue, int min, int max, int flags) { int signvalue = 0; double ufvalue; char iconvert[311]; char fconvert[311]; int iplace = 0; int fplace = 0; int padlen = 0; /* amount to pad */ int zpadlen = 0; int caps = 0; int index; double intpart; double fracpart; double temp; /* * AIX manpage says the default is 0, but Solaris says the default * is 6, and sprintf on AIX defaults to 6 */ if (max < 0) max = 6; ufvalue = abs_val (fvalue); if (fvalue < 0) { signvalue = '-'; } else { if (flags & DP_F_PLUS) { /* Do a sign (+/i) */ signvalue = '+'; } else { if (flags & DP_F_SPACE) signvalue = ' '; } } #if 0 if (flags & DP_F_UP) caps = 1; /* Should characters be upper case? */ #endif #if 0 if (max == 0) ufvalue += 0.5; /* if max = 0 we must round */ #endif /* * Sorry, we only support 16 digits past the decimal because of our * conversion method */ if (max > 16) max = 16; /* We "cheat" by converting the fractional part to integer by * multiplying by a factor of 10 */ temp = ufvalue; my_modf(temp, &intpart); fracpart = ROUND((POW10(max)) * (ufvalue - intpart)); if (fracpart >= POW10(max)) { intpart++; fracpart -= POW10(max); } /* Convert integer part */ do { temp = intpart*0.1; my_modf(temp, &intpart); index = (int) ((temp -intpart +0.05)* 10.0); /* index = (int) (((double)(temp*0.1) -intpart +0.05) *10.0); */ /* printf ("%llf, %f, %x\n", temp, intpart, index); */ iconvert[iplace++] = (caps? "0123456789ABCDEF":"0123456789abcdef")[index]; } while (intpart && (iplace < 311)); if (iplace == 311) iplace--; iconvert[iplace] = 0; /* Convert fractional part */ if (fracpart) { do { temp = fracpart*0.1; my_modf(temp, &fracpart); index = (int) ((temp -fracpart +0.05)* 10.0); /* index = (int) ((((temp/10) -fracpart) +0.05) *10); */ /* printf ("%lf, %lf, %ld\n", temp, fracpart, index); */ fconvert[fplace++] = (caps? "0123456789ABCDEF":"0123456789abcdef")[index]; } while(fracpart && (fplace < 311)); if (fplace == 311) fplace--; } fconvert[fplace] = 0; /* -1 for decimal point, another -1 if we are printing a sign */ padlen = min - iplace - max - 1 - ((signvalue) ? 1 : 0); zpadlen = max - fplace; if (zpadlen < 0) zpadlen = 0; if (padlen < 0) padlen = 0; if (flags & DP_F_MINUS) padlen = -padlen; /* Left Justifty */ if ((flags & DP_F_ZERO) && (padlen > 0)) { if (signvalue) { dopr_outch (buffer, currlen, maxlen, signvalue); --padlen; signvalue = 0; } while (padlen > 0) { dopr_outch (buffer, currlen, maxlen, '0'); --padlen; } } while (padlen > 0) { dopr_outch (buffer, currlen, maxlen, ' '); --padlen; } if (signvalue) dopr_outch (buffer, currlen, maxlen, signvalue); while (iplace > 0) dopr_outch (buffer, currlen, maxlen, iconvert[--iplace]); #ifdef DEBUG_SNPRINTF printf("fmtfp: fplace=%d zpadlen=%d\n", fplace, zpadlen); #endif /* * Decimal point. This should probably use locale to find the correct * char to print out. */ if (max > 0) { dopr_outch (buffer, currlen, maxlen, '.'); while (zpadlen > 0) { dopr_outch (buffer, currlen, maxlen, '0'); --zpadlen; } while (fplace > 0) dopr_outch (buffer, currlen, maxlen, fconvert[--fplace]); } while (padlen < 0) { dopr_outch (buffer, currlen, maxlen, ' '); ++padlen; } } static void dopr_outch(char *buffer, size_t *currlen, size_t maxlen, char c) { if (*currlen < maxlen) { buffer[(*currlen)] = c; } (*currlen)++; } /* yes this really must be a ||. Don't muck with this (tridge) */ #if !defined(HAVE_VSNPRINTF) || !defined(HAVE_C99_VSNPRINTF) int vsnprintf (char *str, size_t count, const char *fmt, va_list args) { return dopr(str, count, fmt, args); } #endif /* yes this really must be a ||. Don't muck wiith this (tridge) * * The logic for these two is that we need our own definition if the * OS *either* has no definition of *sprintf, or if it does have one * that doesn't work properly according to the autoconf test. Perhaps * these should really be smb_snprintf to avoid conflicts with buggy * linkers? -- mbp */ #if !defined(HAVE_SNPRINTF) || !defined(HAVE_C99_SNPRINTF) int snprintf(char *str,size_t count,const char *fmt,...) { size_t ret; va_list ap; va_start(ap, fmt); ret = vsnprintf(str, count, fmt, ap); va_end(ap); return ret; } #endif #endif #ifndef HAVE_VASPRINTF int vasprintf(char **ptr, const char *format, va_list ap) { int ret; va_list ap2; VA_COPY(ap2, ap); ret = vsnprintf(NULL, 0, format, ap2); if (ret <= 0) return ret; (*ptr) = (char *)malloc(ret+1); if (!*ptr) return -1; VA_COPY(ap2, ap); ret = vsnprintf(*ptr, ret+1, format, ap2); return ret; } #endif #ifndef HAVE_ASPRINTF int asprintf(char **ptr, const char *format, ...) { va_list ap; int ret; *ptr = NULL; va_start(ap, format); ret = vasprintf(ptr, format, ap); va_end(ap); return ret; } #endif #ifndef HAVE_VSYSLOG #ifdef HAVE_SYSLOG void vsyslog (int facility_priority, char *format, va_list arglist) { char *msg = NULL; vasprintf(&msg, format, arglist); if (!msg) return; syslog(facility_priority, "%s", msg); SAFE_FREE(msg); } #endif /* HAVE_SYSLOG */ #endif /* HAVE_VSYSLOG */ #ifdef TEST_SNPRINTF int sprintf(char *str,const char *fmt,...); int main (void) { char buf1[1024]; char buf2[1024]; char *fp_fmt[] = { "%1.1f", "%-1.5f", "%1.5f", "%123.9f", "%10.5f", "% 10.5f", "%+22.9f", "%+4.9f", "%01.3f", "%4f", "%3.1f", "%3.2f", "%.0f", "%f", "-16.16f", NULL }; double fp_nums[] = { 6442452944.1234, -1.5, 134.21, 91340.2, 341.1234, 0203.9, 0.96, 0.996, 0.9996, 1.996, 4.136, 5.030201, 0}; char *int_fmt[] = { "%-1.5d", "%1.5d", "%123.9d", "%5.5d", "%10.5d", "% 10.5d", "%+22.33d", "%01.3d", "%4d", "%d", NULL }; long int_nums[] = { -1, 134, 91340, 341, 0203, 0}; char *str_fmt[] = { "10.5s", "5.10s", "10.1s", "0.10s", "10.0s", "1.10s", "%s", "%.1s", "%.10s", "%10s", NULL }; char *str_vals[] = {"hello", "a", "", "a longer string", NULL}; int x, y; int fail = 0; int num = 0; printf ("Testing snprintf format codes against system sprintf...\n"); for (x = 0; fp_fmt[x] ; x++) { for (y = 0; fp_nums[y] != 0 ; y++) { int l1 = snprintf(NULL, 0, fp_fmt[x], fp_nums[y]); int l2 = snprintf(buf1, sizeof(buf1), fp_fmt[x], fp_nums[y]); sprintf (buf2, fp_fmt[x], fp_nums[y]); if (strcmp (buf1, buf2)) { printf("snprintf doesn't match Format: %s\n\tsnprintf = [%s]\n\t sprintf = [%s]\n", fp_fmt[x], buf1, buf2); fail++; } if (l1 != l2) { printf("snprintf l1 != l2 (%d %d) %s\n", l1, l2, fp_fmt[x]); fail++; } num++; } } for (x = 0; int_fmt[x] ; x++) { for (y = 0; int_nums[y] != 0 ; y++) { int l1 = snprintf(NULL, 0, int_fmt[x], int_nums[y]); int l2 = snprintf(buf1, sizeof(buf1), int_fmt[x], int_nums[y]); sprintf (buf2, int_fmt[x], int_nums[y]); if (strcmp (buf1, buf2)) { printf("snprintf doesn't match Format: %s\n\tsnprintf = [%s]\n\t sprintf = [%s]\n", int_fmt[x], buf1, buf2); fail++; } if (l1 != l2) { printf("snprintf l1 != l2 (%d %d) %s\n", l1, l2, int_fmt[x]); fail++; } num++; } } for (x = 0; str_fmt[x] ; x++) { for (y = 0; str_vals[y] != 0 ; y++) { int l1 = snprintf(NULL, 0, str_fmt[x], str_vals[y]); int l2 = snprintf(buf1, sizeof(buf1), str_fmt[x], str_vals[y]); sprintf (buf2, str_fmt[x], str_vals[y]); if (strcmp (buf1, buf2)) { printf("snprintf doesn't match Format: %s\n\tsnprintf = [%s]\n\t sprintf = [%s]\n", str_fmt[x], buf1, buf2); fail++; } if (l1 != l2) { printf("snprintf l1 != l2 (%d %d) %s\n", l1, l2, str_fmt[x]); fail++; } num++; } } printf ("%d tests failed out of %d.\n", fail, num); printf("seeing how many digits we support\n"); { double v0 = 0.12345678901234567890123456789012345678901; for (x=0; x<100; x++) { double p = pow(10, x); double r = v0*p; snprintf(buf1, sizeof(buf1), "%1.1f", r); sprintf(buf2, "%1.1f", r); if (strcmp(buf1, buf2)) { printf("we seem to support %d digits\n", x-1); break; } } } return 0; } #endif /* SNPRINTF_TEST */