--- /dev/null
+/* snprintf - compatibility implementation of snprintf, vsnprintf
+ *
+ * Copyright (c) 2013, NLnet Labs. All rights reserved.
+ *
+ * This software is open source.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * Neither the name of the NLNET LABS nor the names of its contributors may
+ * be used to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include <stdio.h>
+#include <ctype.h>
+#include <string.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <errno.h>
+
+/* for test */
+/* #define SNPRINTF_TEST 1 */
+#ifdef SNPRINTF_TEST
+#define snprintf my_snprintf
+#define vsnprintf my_vsnprintf
+#endif /* SNPRINTF_TEST */
+
+int snprintf(char* str, size_t size, const char* format, ...);
+int vsnprintf(char* str, size_t size, const char* format, va_list arg);
+
+/**
+ * Very portable snprintf implementation, limited in functionality,
+ * esp. for %[capital] %[nonportable] and so on. Reduced float functionality,
+ * mostly in formatting and range (e+-16), for %f and %g.
+ *
+ * %s, %d, %u, %i, %x, %c, %n and %% are fully supported.
+ * This includes width, precision, flags 0- +, and *(arg for wid,prec).
+ * %f, %g, %m, %p have reduced support, support for wid,prec,flags,*, but
+ * less floating point range, no %e formatting for %g.
+ */
+int snprintf(char* str, size_t size, const char* format, ...)
+{
+ int r;
+ va_list args;
+ va_start(args, format);
+ r = vsnprintf(str, size, format, args);
+ va_end(args);
+ return r;
+}
+
+/* get printout designation:
+ * conversion specifier: x, d, u, s, c, n, m, p
+ * flags: # not supported
+ * 0 zeropad (on the left)
+ * - left adjust (right by default)
+ * ' ' printspace for positive number (in - position).
+ * + alwayssign
+ * fieldwidth: [1-9][0-9]* minimum field width.
+ * if this is * then type int next argument specifies the minwidth.
+ * if this is negative, the - flag is set (with positive width).
+ * precision: period[digits]*, %.2x.
+ * if this is * then type int next argument specifies the precision.
+ * just '.' or negative value means precision=0.
+ * this is mindigits to print for d, i, u, x
+ * this is aftercomma digits for f
+ * this is max number significant digits for g
+ * maxnumber characters to be printed for s
+ * length: 0-none (int), 1-l (long), 2-ll (long long)
+ * notsupported: hh (char), h (short), L (long double), q, j, z, t
+ * Does not support %m$ and *m$ argument designation as array indices.
+ * Does not support %#x
+ *
+ */
+static int
+get_designation(const char** fmt, va_list arg, int* minw, int* precision,
+ int* prgiven, int* zeropad, int* minus, int* plus, int* space,
+ int* length)
+{
+ *minw = 0;
+ *precision = 1;
+ *prgiven = 0;
+ *zeropad = 0;
+ *minus = 0;
+ *plus = 0;
+ *space = 0;
+ *length = 0;
+
+ /* get flags in any order */
+ for(;;) {
+ if(**fmt == '0')
+ *zeropad = 1;
+ else if(**fmt == '-')
+ *minus = 1;
+ else if(**fmt == '+')
+ *plus = 1;
+ else if(**fmt == ' ')
+ *space = 1;
+ else break;
+ (*fmt)++;
+ }
+
+ /* field width */
+ if(**fmt == '*') {
+ (*fmt)++; /* skip char */
+ *minw = va_arg(arg, int);
+ if(*minw < 0) {
+ *minus = 1;
+ *minw = -(*minw);
+ }
+ } else while(**fmt >= '0' && **fmt <= '9') {
+ *minw = (*minw)*10 + (*(*fmt)++)-'0';
+ }
+
+ /* precision */
+ if(**fmt == '.') {
+ (*fmt)++; /* skip period */
+ *prgiven = 1;
+ *precision = 0;
+ if(**fmt == '*') {
+ (*fmt)++; /* skip char */
+ *precision = va_arg(arg, int);
+ if(*precision < 0)
+ *precision = 0;
+ } else while(**fmt >= '0' && **fmt <= '9') {
+ *precision = (*precision)*10 + (*(*fmt)++)-'0';
+ }
+ }
+
+ /* length */
+ if(**fmt == 'l') {
+ (*fmt)++; /* skip char */
+ *length = 1;
+ if(**fmt == 'l') {
+ (*fmt)++; /* skip char */
+ *length = 2;
+ }
+ }
+
+ /* return the conversion */
+ if(!*fmt) return 0;
+ return *(*fmt)++;
+}
+
+/** add padding to string */
+static void
+print_pad(char** at, size_t* left, int* ret, char p, int num)
+{
+ while(num--) {
+ if(*left > 1) {
+ *(*at)++ = p;
+ (*left)--;
+ }
+ (*ret)++;
+ }
+}
+
+/** get negative symbol, 0 if none */
+static char
+get_negsign(int negative, int plus, int space)
+{
+ if(negative)
+ return '-';
+ if(plus)
+ return '+';
+ if(space)
+ return ' ';
+ return 0;
+}
+
+#define PRINT_DEC_BUFSZ 32 /* 20 is enough for 64 bit decimals */
+/** print decimal into buffer, returns length */
+static int
+print_dec(char* buf, int max, unsigned int value)
+{
+ int i = 0;
+ if(value == 0) {
+ if(max > 0) {
+ buf[0] = '0';
+ i = 1;
+ }
+ } else while(value && i < max) {
+ buf[i++] = '0' + value % 10;
+ value /= 10;
+ }
+ return i;
+}
+
+/** print long decimal into buffer, returns length */
+static int
+print_dec_l(char* buf, int max, unsigned long value)
+{
+ int i = 0;
+ if(value == 0) {
+ if(max > 0) {
+ buf[0] = '0';
+ i = 1;
+ }
+ } else while(value && i < max) {
+ buf[i++] = '0' + value % 10;
+ value /= 10;
+ }
+ return i;
+}
+
+/** print long decimal into buffer, returns length */
+static int
+print_dec_ll(char* buf, int max, unsigned long long value)
+{
+ int i = 0;
+ if(value == 0) {
+ if(max > 0) {
+ buf[0] = '0';
+ i = 1;
+ }
+ } else while(value && i < max) {
+ buf[i++] = '0' + value % 10;
+ value /= 10;
+ }
+ return i;
+}
+
+/** print hex into buffer, returns length */
+static int
+print_hex(char* buf, int max, unsigned int value)
+{
+ const char* h = "0123456789abcdef";
+ int i = 0;
+ if(value == 0) {
+ if(max > 0) {
+ buf[0] = '0';
+ i = 1;
+ }
+ } else while(value && i < max) {
+ buf[i++] = h[value & 0x0f];
+ value >>= 4;
+ }
+ return i;
+}
+
+/** print long hex into buffer, returns length */
+static int
+print_hex_l(char* buf, int max, unsigned long value)
+{
+ const char* h = "0123456789abcdef";
+ int i = 0;
+ if(value == 0) {
+ if(max > 0) {
+ buf[0] = '0';
+ i = 1;
+ }
+ } else while(value && i < max) {
+ buf[i++] = h[value & 0x0f];
+ value >>= 4;
+ }
+ return i;
+}
+
+/** print long long hex into buffer, returns length */
+static int
+print_hex_ll(char* buf, int max, unsigned long long value)
+{
+ const char* h = "0123456789abcdef";
+ int i = 0;
+ if(value == 0) {
+ if(max > 0) {
+ buf[0] = '0';
+ i = 1;
+ }
+ } else while(value && i < max) {
+ buf[i++] = h[value & 0x0f];
+ value >>= 4;
+ }
+ return i;
+}
+
+/** copy string into result, reversed */
+static void
+spool_str_rev(char** at, size_t* left, int* ret, const char* buf, int len)
+{
+ int i = len;
+ while(i) {
+ if(*left > 1) {
+ *(*at)++ = buf[--i];
+ (*left)--;
+ } else --i;
+ (*ret)++;
+ }
+}
+
+/** copy string into result */
+static void
+spool_str(char** at, size_t* left, int* ret, const char* buf, int len)
+{
+ int i;
+ for(i=0; i<len; i++) {
+ if(*left > 1) {
+ *(*at)++ = buf[i];
+ (*left)--;
+ }
+ (*ret)++;
+ }
+}
+
+/** print number formatted */
+static void
+print_num(char** at, size_t* left, int* ret, int minw, int precision,
+ int prgiven, int zeropad, int minus, int plus, int space,
+ int zero, int negative, char* buf, int len)
+{
+ int w = len; /* excludes minus sign */
+ char s = get_negsign(negative, plus, space);
+ if(minus) {
+ /* left adjust the number into the field, space padding */
+ /* calc numw = [sign][zeroes][number] */
+ int numw = w;
+ if(precision == 0 && zero) numw = 0;
+ if(numw < precision) numw = precision;
+ if(s) numw++;
+
+ /* sign */
+ if(s) print_pad(at, left, ret, s, 1);
+
+ /* number */
+ if(precision == 0 && zero) {
+ /* "" for the number */
+ } else {
+ if(w < precision)
+ print_pad(at, left, ret, '0', precision - w);
+ spool_str_rev(at, left, ret, buf, len);
+ }
+ /* spaces */
+ if(numw < minw)
+ print_pad(at, left, ret, ' ', minw - numw);
+ } else {
+ /* pad on the left of the number */
+ /* calculate numw has width of [sign][zeroes][number] */
+ int numw = w;
+ if(precision == 0 && zero) numw = 0;
+ if(numw < precision) numw = precision;
+ if(!prgiven && zeropad && numw < minw) numw = minw;
+ else if(s) numw++;
+
+ /* pad with spaces */
+ if(numw < minw)
+ print_pad(at, left, ret, ' ', minw - numw);
+ /* print sign (and one less zeropad if so) */
+ if(s) {
+ print_pad(at, left, ret, s, 1);
+ numw--;
+ }
+ /* pad with zeroes */
+ if(w < numw)
+ print_pad(at, left, ret, '0', numw - w);
+ if(precision == 0 && zero)
+ return;
+ /* print the characters for the value */
+ spool_str_rev(at, left, ret, buf, len);
+ }
+}
+
+/** print %d and %i */
+static void
+print_num_d(char** at, size_t* left, int* ret, int value,
+ int minw, int precision, int prgiven, int zeropad, int minus,
+ int plus, int space)
+{
+ char buf[PRINT_DEC_BUFSZ];
+ int negative = (value < 0);
+ int zero = (value == 0);
+ int len = print_dec(buf, (int)sizeof(buf),
+ (unsigned int)(negative?-value:value));
+ print_num(at, left, ret, minw, precision, prgiven, zeropad, minus,
+ plus, space, zero, negative, buf, len);
+}
+
+/** print %ld and %li */
+static void
+print_num_ld(char** at, size_t* left, int* ret, long value,
+ int minw, int precision, int prgiven, int zeropad, int minus,
+ int plus, int space)
+{
+ char buf[PRINT_DEC_BUFSZ];
+ int negative = (value < 0);
+ int zero = (value == 0);
+ int len = print_dec_l(buf, (int)sizeof(buf),
+ (unsigned long)(negative?-value:value));
+ print_num(at, left, ret, minw, precision, prgiven, zeropad, minus,
+ plus, space, zero, negative, buf, len);
+}
+
+/** print %lld and %lli */
+static void
+print_num_lld(char** at, size_t* left, int* ret, long long value,
+ int minw, int precision, int prgiven, int zeropad, int minus,
+ int plus, int space)
+{
+ char buf[PRINT_DEC_BUFSZ];
+ int negative = (value < 0);
+ int zero = (value == 0);
+ int len = print_dec_ll(buf, (int)sizeof(buf),
+ (unsigned long long)(negative?-value:value));
+ print_num(at, left, ret, minw, precision, prgiven, zeropad, minus,
+ plus, space, zero, negative, buf, len);
+}
+
+/** print %u */
+static void
+print_num_u(char** at, size_t* left, int* ret, unsigned int value,
+ int minw, int precision, int prgiven, int zeropad, int minus,
+ int plus, int space)
+{
+ char buf[PRINT_DEC_BUFSZ];
+ int negative = 0;
+ int zero = (value == 0);
+ int len = print_dec(buf, (int)sizeof(buf), value);
+ print_num(at, left, ret, minw, precision, prgiven, zeropad, minus,
+ plus, space, zero, negative, buf, len);
+}
+
+/** print %lu */
+static void
+print_num_lu(char** at, size_t* left, int* ret, unsigned long value,
+ int minw, int precision, int prgiven, int zeropad, int minus,
+ int plus, int space)
+{
+ char buf[PRINT_DEC_BUFSZ];
+ int negative = 0;
+ int zero = (value == 0);
+ int len = print_dec_l(buf, (int)sizeof(buf), value);
+ print_num(at, left, ret, minw, precision, prgiven, zeropad, minus,
+ plus, space, zero, negative, buf, len);
+}
+
+/** print %llu */
+static void
+print_num_llu(char** at, size_t* left, int* ret, unsigned long long value,
+ int minw, int precision, int prgiven, int zeropad, int minus,
+ int plus, int space)
+{
+ char buf[PRINT_DEC_BUFSZ];
+ int negative = 0;
+ int zero = (value == 0);
+ int len = print_dec_ll(buf, (int)sizeof(buf), value);
+ print_num(at, left, ret, minw, precision, prgiven, zeropad, minus,
+ plus, space, zero, negative, buf, len);
+}
+
+/** print %x */
+static void
+print_num_x(char** at, size_t* left, int* ret, unsigned int value,
+ int minw, int precision, int prgiven, int zeropad, int minus,
+ int plus, int space)
+{
+ char buf[PRINT_DEC_BUFSZ];
+ int negative = 0;
+ int zero = (value == 0);
+ int len = print_hex(buf, (int)sizeof(buf), value);
+ print_num(at, left, ret, minw, precision, prgiven, zeropad, minus,
+ plus, space, zero, negative, buf, len);
+}
+
+/** print %lx */
+static void
+print_num_lx(char** at, size_t* left, int* ret, unsigned long value,
+ int minw, int precision, int prgiven, int zeropad, int minus,
+ int plus, int space)
+{
+ char buf[PRINT_DEC_BUFSZ];
+ int negative = 0;
+ int zero = (value == 0);
+ int len = print_hex_l(buf, (int)sizeof(buf), value);
+ print_num(at, left, ret, minw, precision, prgiven, zeropad, minus,
+ plus, space, zero, negative, buf, len);
+}
+
+/** print %llx */
+static void
+print_num_llx(char** at, size_t* left, int* ret, unsigned long long value,
+ int minw, int precision, int prgiven, int zeropad, int minus,
+ int plus, int space)
+{
+ char buf[PRINT_DEC_BUFSZ];
+ int negative = 0;
+ int zero = (value == 0);
+ int len = print_hex_ll(buf, (int)sizeof(buf), value);
+ print_num(at, left, ret, minw, precision, prgiven, zeropad, minus,
+ plus, space, zero, negative, buf, len);
+}
+
+/** print %llp */
+static void
+print_num_llp(char** at, size_t* left, int* ret, unsigned long long value,
+ int minw, int precision, int prgiven, int zeropad, int minus,
+ int plus, int space)
+{
+ char buf[PRINT_DEC_BUFSZ];
+ int negative = 0;
+ int zero = (value == 0);
+ int len = print_hex_ll(buf, (int)sizeof(buf), value);
+ if(zero) {
+ buf[0]=')';
+ buf[1]='l';
+ buf[2]='i';
+ buf[3]='n';
+ buf[4]='(';
+ len = 5;
+ } else {
+ /* put '0x' in front of the (reversed) buffer result */
+ if(len < PRINT_DEC_BUFSZ)
+ buf[len++] = 'x';
+ if(len < PRINT_DEC_BUFSZ)
+ buf[len++] = '0';
+ }
+ print_num(at, left, ret, minw, precision, prgiven, zeropad, minus,
+ plus, space, zero, negative, buf, len);
+}
+
+#define PRINT_FLOAT_BUFSZ 64 /* xx.yy with 20.20 about the max */
+/** spool remainder after the decimal point to buffer, in reverse */
+static int
+print_remainder(char* buf, int max, double r, int prec)
+{
+ unsigned long long cap = 1;
+ unsigned long long value;
+ int len, i;
+ if(prec > 19) prec = 19; /* max we can do */
+ if(max < prec) return 0;
+ for(i=0; i<prec; i++) {
+ cap *= 10;
+ }
+ r *= (double)cap;
+ value = (unsigned long long)r;
+ /* see if we need to round up */
+ if(((unsigned long long)((r - (double)value)*10.0)) >= 5) {
+ value++;
+ /* that might carry to numbers before the comma, if so,
+ * just ignore that rounding. failure because 64bitprintout */
+ if(value >= cap)
+ value = cap-1;
+ }
+ len = print_dec_ll(buf, max, value);
+ while(len < prec) { /* pad with zeroes, e.g. if 0.0012 */
+ buf[len++] = '0';
+ }
+ if(len < max)
+ buf[len++] = '.';
+ return len;
+}
+
+/** spool floating point to buffer */
+static int
+print_float(char* buf, int max, double value, int prec)
+{
+ /* as xxx.xxx if prec==0, no '.', with prec decimals after . */
+ /* no conversion for NAN and INF, because we do not want to require
+ linking with -lm. */
+ /* Thus, the conversions use 64bit integers to convert the numbers,
+ * which makes 19 digits before and after the decimal point the max */
+ unsigned long long whole = (unsigned long long)value;
+ double remain = value - (double)whole;
+ int len = 0;
+ if(prec != 0)
+ len = print_remainder(buf, max, remain, prec);
+ len += print_dec_ll(buf+len, max-len, whole);
+ return len;
+}
+
+/** print %f */
+static void
+print_num_f(char** at, size_t* left, int* ret, double value,
+ int minw, int precision, int prgiven, int zeropad, int minus,
+ int plus, int space)
+{
+ char buf[PRINT_FLOAT_BUFSZ];
+ int negative = (value < 0);
+ int zero = 0;
+ int len;
+ if(!prgiven) precision = 6;
+ len = print_float(buf, (int)sizeof(buf), negative?-value:value,
+ precision);
+ print_num(at, left, ret, minw, 1, 0, zeropad, minus,
+ plus, space, zero, negative, buf, len);
+}
+
+/* rudimentary %g support */
+static int
+print_float_g(char* buf, int max, double value, int prec)
+{
+ unsigned long long whole = (unsigned long long)value;
+ double remain = value - (double)whole;
+ int before = 0;
+ int len = 0;
+
+ /* number of digits before the decimal point */
+ while(whole > 0) {
+ before++;
+ whole /= 10;
+ }
+ whole = (unsigned long long)value;
+
+ if(prec > before && remain != 0.0) {
+ /* see if the last decimals are zero, if so, skip them */
+ len = print_remainder(buf, max, remain, prec-before);
+ while(len > 0 && buf[0]=='0') {
+ memmove(buf, buf+1, --len);
+ }
+ }
+ len += print_dec_ll(buf+len, max-len, whole);
+ return len;
+}
+
+
+/** print %g */
+static void
+print_num_g(char** at, size_t* left, int* ret, double value,
+ int minw, int precision, int prgiven, int zeropad, int minus,
+ int plus, int space)
+{
+ char buf[PRINT_FLOAT_BUFSZ];
+ int negative = (value < 0);
+ int zero = 0;
+ int len;
+ if(!prgiven) precision = 6;
+ if(precision == 0) precision = 1;
+ len = print_float_g(buf, (int)sizeof(buf), negative?-value:value,
+ precision);
+ print_num(at, left, ret, minw, 1, 0, zeropad, minus,
+ plus, space, zero, negative, buf, len);
+}
+
+
+/** strnlen (compat implementation) */
+static int
+my_strnlen(const char* s, int max)
+{
+ int i;
+ for(i=0; i<max; i++)
+ if(s[i]==0)
+ return i;
+ return max;
+}
+
+/** print %s */
+static void
+print_str(char** at, size_t* left, int* ret, char* s,
+ int minw, int precision, int prgiven, int minus)
+{
+ int w;
+ /* with prec: no more than x characters from this string, stop at 0 */
+ if(prgiven)
+ w = my_strnlen(s, precision);
+ else w = (int)strlen(s); /* up to the nul */
+ if(w < minw && !minus)
+ print_pad(at, left, ret, ' ', minw - w);
+ spool_str(at, left, ret, s, w);
+ if(w < minw && minus)
+ print_pad(at, left, ret, ' ', minw - w);
+}
+
+/** print %c */
+static void
+print_char(char** at, size_t* left, int* ret, int c,
+ int minw, int minus)
+{
+ if(1 < minw && !minus)
+ print_pad(at, left, ret, ' ', minw - 1);
+ print_pad(at, left, ret, c, 1);
+ if(1 < minw && minus)
+ print_pad(at, left, ret, ' ', minw - 1);
+}
+
+/** print the designation */
+static void
+print_designation(char** at, size_t* left, int* ret, va_list arg,
+ int conv, int minw, int precision, int prgiven, int zeropad, int minus,
+ int plus, int space, int length)
+{
+ switch(conv) {
+ case 'i':
+ case 'd':
+ if(length == 0)
+ print_num_d(at, left, ret, va_arg(arg, int),
+ minw, precision, prgiven, zeropad, minus, plus, space);
+ else if(length == 1)
+ print_num_ld(at, left, ret, va_arg(arg, long),
+ minw, precision, prgiven, zeropad, minus, plus, space);
+ else if(length == 2)
+ print_num_lld(at, left, ret,
+ va_arg(arg, long long),
+ minw, precision, prgiven, zeropad, minus, plus, space);
+ return;
+ case 'u':
+ if(length == 0)
+ print_num_u(at, left, ret,
+ va_arg(arg, unsigned int),
+ minw, precision, prgiven, zeropad, minus, plus, space);
+ else if(length == 1)
+ print_num_lu(at, left, ret,
+ va_arg(arg, unsigned long),
+ minw, precision, prgiven, zeropad, minus, plus, space);
+ else if(length == 2)
+ print_num_llu(at, left, ret,
+ va_arg(arg, unsigned long long),
+ minw, precision, prgiven, zeropad, minus, plus, space);
+ return;
+ case 'x':
+ if(length == 0)
+ print_num_x(at, left, ret,
+ va_arg(arg, unsigned int),
+ minw, precision, prgiven, zeropad, minus, plus, space);
+ else if(length == 1)
+ print_num_lx(at, left, ret,
+ va_arg(arg, unsigned long),
+ minw, precision, prgiven, zeropad, minus, plus, space);
+ else if(length == 2)
+ print_num_llx(at, left, ret,
+ va_arg(arg, unsigned long long),
+ minw, precision, prgiven, zeropad, minus, plus, space);
+ return;
+ case 's':
+ print_str(at, left, ret, va_arg(arg, char*),
+ minw, precision, prgiven, minus);
+ return;
+ case 'c':
+ print_char(at, left, ret, va_arg(arg, int),
+ minw, minus);
+ return;
+ case 'n':
+ *va_arg(arg, int*) = *ret;
+ return;
+ case 'm':
+ print_str(at, left, ret, strerror(errno),
+ minw, precision, prgiven, minus);
+ return;
+ case 'p':
+ print_num_llp(at, left, ret,
+ (unsigned long long)va_arg(arg, void*),
+ minw, precision, prgiven, zeropad, minus, plus, space);
+ return;
+ case '%':
+ print_pad(at, left, ret, '%', 1);
+ return;
+ case 'f':
+ print_num_f(at, left, ret, va_arg(arg, double),
+ minw, precision, prgiven, zeropad, minus, plus, space);
+ return;
+ case 'g':
+ print_num_g(at, left, ret, va_arg(arg, double),
+ minw, precision, prgiven, zeropad, minus, plus, space);
+ return;
+ /* unknown */
+ default:
+ case 0: return;
+ }
+}
+
+/**
+ * Print to string.
+ * str: string buffer for result. result will be null terminated.
+ * size: size of the buffer. null is put inside buffer.
+ * format: printf format string.
+ * arg: '...' arguments to print.
+ * returns number of characters. a null is printed after this.
+ * return number of bytes that would have been written
+ * if the buffer had been large enough.
+ *
+ * supported format specifiers:
+ * %s, %u, %d, %x, %i, %f, %g, %c, %p, %n.
+ * length: l, ll (for d, u, x).
+ * precision: 6.6d (for d, u, x)
+ * %f, %g precisions, 0.3f
+ * %20s, '.*s'
+ * and %%.
+ */
+int vsnprintf(char* str, size_t size, const char* format, va_list arg)
+{
+ char* at = str;
+ size_t left = size;
+ int ret = 0;
+ const char* fmt = format;
+ int conv, minw, precision, prgiven, zeropad, minus, plus, space, length;
+ while(*fmt) {
+ /* copy string before % */
+ while(*fmt && *fmt!='%') {
+ if(left > 1) {
+ *at++ = *fmt++;
+ left--;
+ } else fmt++;
+ ret++;
+ }
+
+ /* see if we are at end */
+ if(!*fmt) break;
+
+ /* fetch next argument % designation from format string */
+ fmt++; /* skip the '%' */
+ conv = get_designation(&fmt, arg, &minw, &precision, &prgiven,
+ &zeropad, &minus, &plus, &space, &length);
+
+ /* print that argument designation */
+ print_designation(&at, &left, &ret, arg, conv,
+ minw, precision, prgiven, zeropad, minus, plus, space,
+ length);
+ }
+ /* zero terminate */
+ if(left > 0)
+ *at = 0;
+ return ret;
+}
+
+#ifdef SNPRINTF_TEST
+
+/** do tests */
+#undef snprintf
+#define DOTEST(bufsz, result, retval, ...) do { \
+ char buf[bufsz]; \
+ printf("now test %s\n", #__VA_ARGS__); \
+ int r=my_snprintf(buf, sizeof(buf), __VA_ARGS__); \
+ if(r != retval || strcmp(buf, result) != 0) { \
+ printf("error test(%s) was \"%s\":%d\n", \
+ ""#bufsz", "#result", "#retval", "#__VA_ARGS__, \
+ buf, r); \
+ exit(1); \
+ } \
+ r=snprintf(buf, sizeof(buf), __VA_ARGS__); \
+ if(r != retval || strcmp(buf, result) != 0) { \
+ printf("error test(%s) differs with system, \"%s\":%d\n", \
+ ""#bufsz", "#result", "#retval", "#__VA_ARGS__, \
+ buf, r); \
+ exit(1); \
+ } \
+ printf("test(\"%s\":%d) passed\n", buf, r); \
+ } while(0);
+
+/** test program */
+int main(void)
+{
+ int x = 0;
+
+ /* bufsize, expectedstring, expectedretval, snprintf arguments */
+ DOTEST(1024, "hello", 5, "hello");
+ DOTEST(1024, "h", 1, "h");
+ /* warning from gcc for format string, but it does work
+ * DOTEST(1024, "", 0, ""); */
+
+ DOTEST(3, "he", 5, "hello");
+ DOTEST(1, "", 7, "%d", 7823089);
+
+ /* test positive numbers */
+ DOTEST(1024, "0", 1, "%d", 0);
+ DOTEST(1024, "1", 1, "%d", 1);
+ DOTEST(1024, "9", 1, "%d", 9);
+ DOTEST(1024, "15", 2, "%d", 15);
+ DOTEST(1024, "ab15cd", 6, "ab%dcd", 15);
+ DOTEST(1024, "167", 3, "%d", 167);
+ DOTEST(1024, "7823089", 7, "%d", 7823089);
+ DOTEST(1024, " 12", 3, "%3d", 12);
+ DOTEST(1024, "012", 3, "%.3d", 12);
+ DOTEST(1024, "012", 3, "%3.3d", 12);
+ DOTEST(1024, "012", 3, "%03d", 12);
+ DOTEST(1024, " 012", 4, "%4.3d", 12);
+ DOTEST(1024, "", 0, "%.0d", 0);
+
+ /* test negative numbers */
+ DOTEST(1024, "-1", 2, "%d", -1);
+ DOTEST(1024, "-12", 3, "%3d", -12);
+ DOTEST(1024, " -2", 3, "%3d", -2);
+ DOTEST(1024, "-012", 4, "%.3d", -12);
+ DOTEST(1024, "-012", 4, "%3.3d", -12);
+ DOTEST(1024, "-012", 4, "%4.3d", -12);
+ DOTEST(1024, " -012", 5, "%5.3d", -12);
+ DOTEST(1024, "-12", 3, "%03d", -12);
+ DOTEST(1024, "-02", 3, "%03d", -2);
+ DOTEST(1024, "-15", 3, "%d", -15);
+ DOTEST(1024, "-7307", 5, "%d", -7307);
+ DOTEST(1024, "-12 ", 5, "%-5d", -12);
+ DOTEST(1024, "-00012", 6, "%-.5d", -12);
+
+ /* test + and space flags */
+ DOTEST(1024, "+12", 3, "%+d", 12);
+ DOTEST(1024, " 12", 3, "% d", 12);
+
+ /* test %u */
+ DOTEST(1024, "12", 2, "%u", 12);
+ DOTEST(1024, "0", 1, "%u", 0);
+ DOTEST(1024, "4294967295", 10, "%u", 0xffffffff);
+
+ /* test %x */
+ DOTEST(1024, "0", 1, "%x", 0);
+ DOTEST(1024, "c", 1, "%x", 12);
+ DOTEST(1024, "12ab34cd", 8, "%x", 0x12ab34cd);
+
+ /* test %llu, %lld */
+ DOTEST(1024, "18446744073709551615", 20, "%llu",
+ (long long)0xffffffffffffffff);
+ DOTEST(1024, "-9223372036854775808", 20, "%lld",
+ (long long)0x8000000000000000);
+ DOTEST(1024, "9223372036854775808", 19, "%llu",
+ (long long)0x8000000000000000);
+
+ /* test %s */
+ DOTEST(1024, "hello", 5, "%s", "hello");
+ DOTEST(1024, " hello", 10, "%10s", "hello");
+ DOTEST(1024, "hello ", 10, "%-10s", "hello");
+ DOTEST(1024, "he", 2, "%.2s", "hello");
+ DOTEST(1024, " he", 4, "%4.2s", "hello");
+ DOTEST(1024, " h", 4, "%4.2s", "h");
+
+ /* test %c */
+ DOTEST(1024, "a", 1, "%c", 'a');
+ /* warning from gcc for format string, but it does work
+ DOTEST(1024, " a", 5, "%5c", 'a');
+ DOTEST(1024, "a", 1, "%.0c", 'a'); */
+
+ /* test %n */
+ DOTEST(1024, "hello", 5, "hello%n", &x);
+ if(x != 5) { printf("the %%n failed\n"); exit(1); }
+
+ /* test %m */
+ errno = 0;
+ DOTEST(1024, "Success", 7, "%m");
+
+ /* test %p */
+ DOTEST(1024, "0x10", 4, "%p", (void*)0x10);
+ DOTEST(1024, "(nil)", 5, "%p", (void*)0x0);
+
+ /* test %% */
+ DOTEST(1024, "%", 1, "%%");
+
+ /* test %f */
+ DOTEST(1024, "0.000000", 8, "%f", 0.0);
+ DOTEST(1024, "0.00", 4, "%.2f", 0.0);
+ /* differs, "-0.00" DOTEST(1024, "0.00", 4, "%.2f", -0.0); */
+ DOTEST(1024, "234.00", 6, "%.2f", 234.005);
+ DOTEST(1024, "8973497.1246", 12, "%.4f", 8973497.12456);
+ DOTEST(1024, "-12.000000", 10, "%f", -12.0);
+ DOTEST(1024, "6", 1, "%.0f", 6.0);
+
+ DOTEST(1024, "6", 1, "%g", 6.0);
+ DOTEST(1024, "6.1", 3, "%g", 6.1);
+ DOTEST(1024, "6.15", 4, "%g", 6.15);
+
+ /* These format strings are from the code of NSD, Unbound, ldns */
+
+ DOTEST(1024, "abcdef", 6, "%s", "abcdef");
+ DOTEST(1024, "005", 3, "%03u", 5);
+ DOTEST(1024, "12345", 5, "%03u", 12345);
+ DOTEST(1024, "5", 1, "%d", 5);
+ DOTEST(1024, "(nil)", 5, "%p", NULL);
+ DOTEST(1024, "12345", 5, "%ld", (long)12345);
+ DOTEST(1024, "12345", 5, "%lu", (long)12345);
+ DOTEST(1024, " 12345", 12, "%12u", (unsigned)12345);
+ DOTEST(1024, "12345", 5, "%u", (unsigned)12345);
+ DOTEST(1024, "12345", 5, "%llu", (unsigned long long)12345);
+ DOTEST(1024, "12345", 5, "%x", 0x12345);
+ DOTEST(1024, "12345", 5, "%llx", (long long)0x12345);
+ DOTEST(1024, "012345", 6, "%6.6d", 12345);
+ DOTEST(1024, "012345", 6, "%6.6u", 12345);
+ DOTEST(1024, "1234.54", 7, "%g", 1234.54);
+ DOTEST(1024, "123456789.54", 12, "%.12g", 123456789.54);
+ DOTEST(1024, "3456789123456.54", 16, "%.16g", 3456789123456.54);
+ /* %24g does not work with 24 digits, not enough accuracy,
+ * the first 16 digits are correct */
+ DOTEST(1024, "12345", 5, "%3.3d", 12345);
+ DOTEST(1024, "000", 3, "%3.3d", 0);
+ DOTEST(1024, "001", 3, "%3.3d", 1);
+ DOTEST(1024, "012", 3, "%3.3d", 12);
+ DOTEST(1024, "-012", 4, "%3.3d", -12);
+ DOTEST(1024, "he", 2, "%.2s", "hello");
+ DOTEST(1024, "he", 2, "%.*s", 2, "hello");
+ DOTEST(1024, " hello", 7, "%*s", 7, "hello");
+ DOTEST(1024, "hello ", 7, "%*s", -7, "hello");
+ DOTEST(1024, "0", 1, "%c", '0');
+ DOTEST(1024, "A", 1, "%c", 'A');
+ DOTEST(1024, "", 1, "%c", 0);
+ DOTEST(1024, "\010", 1, "%c", 8);
+ DOTEST(1024, "%", 1, "%%");
+ DOTEST(1024, "0a", 2, "%02x", 0x0a);
+ DOTEST(1024, "bd", 2, "%02x", 0xbd);
+ DOTEST(1024, "12", 2, "%02ld", (long)12);
+ DOTEST(1024, "02", 2, "%02ld", (long)2);
+ DOTEST(1024, "02", 2, "%02u", (unsigned)2);
+ DOTEST(1024, "765432", 6, "%05u", (unsigned)765432);
+ DOTEST(1024, "10.234", 6, "%0.3f", 10.23421);
+ DOTEST(1024, "123456.234", 10, "%0.3f", 123456.23421);
+ DOTEST(1024, "123456789.234", 13, "%0.3f", 123456789.23421);
+ DOTEST(1024, "123456.23", 9, "%.2f", 123456.23421);
+ DOTEST(1024, "123456", 6, "%.0f", 123456.23421);
+ DOTEST(1024, "0123", 4, "%.4x", 0x0123);
+ DOTEST(1024, "00000123", 8, "%.8x", 0x0123);
+ DOTEST(1024, "ffeb0cde", 8, "%.8x", 0xffeb0cde);
+ DOTEST(1024, " 987654321", 10, "%10lu", (unsigned long)987654321);
+ DOTEST(1024, " 987654321", 12, "%12lu", (unsigned long)987654321);
+ DOTEST(1024, "987654321", 9, "%i", 987654321);
+ DOTEST(1024, "-87654321", 9, "%i", -87654321);
+ DOTEST(1024, "hello ", 16, "%-16s", "hello");
+ DOTEST(1024, " ", 16, "%-16s", "");
+ DOTEST(1024, "a ", 16, "%-16s", "a");
+ DOTEST(1024, "foobarfoobar ", 16, "%-16s", "foobarfoobar");
+ DOTEST(1024, "foobarfoobarfoobar", 18, "%-16s", "foobarfoobarfoobar");
+
+ /* combined expressions */
+ DOTEST(1024, "foo 1.0 size 512 edns", 21,
+ "foo %s size %d %s%s", "1.0", 512, "", "edns");
+ DOTEST(15, "foo 1.0 size 5", 21,
+ "foo %s size %d %s%s", "1.0", 512, "", "edns");
+ DOTEST(1024, "packet 1203ceff id", 18,
+ "packet %2.2x%2.2x%2.2x%2.2x id", 0x12, 0x03, 0xce, 0xff);
+
+ return 0;
+}
+#endif /* SNPRINTF_TEST */
projects / thirdparty / unbound.git / commitdiff
