[279] | 1 | /***************************************************************************
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| 2 | * _ _ ____ _
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| 3 | * Project ___| | | | _ \| |
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| 4 | * / __| | | | |_) | |
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| 5 | * | (__| |_| | _ <| |___
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| 6 | * \___|\___/|_| \_\_____|
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| 7 | *
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| 8 | * Copyright (C) 1999 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al.
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| 9 | *
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| 10 | * This software is licensed as described in the file COPYING, which
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| 11 | * you should have received as part of this distribution. The terms
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| 12 | * are also available at https://curl.haxx.se/docs/copyright.html.
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| 13 | *
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| 14 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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| 15 | * copies of the Software, and permit persons to whom the Software is
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| 16 | * furnished to do so, under the terms of the COPYING file.
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| 17 | *
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| 18 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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| 19 | * KIND, either express or implied.
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| 20 | *
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| 21 | *
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| 22 | * Purpose:
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| 23 | * A merge of Bjorn Reese's format() function and Daniel's dsprintf()
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| 24 | * 1.0. A full blooded printf() clone with full support for <num>$
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| 25 | * everywhere (parameters, widths and precisions) including variabled
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| 26 | * sized parameters (like doubles, long longs, long doubles and even
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| 27 | * void * in 64-bit architectures).
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| 28 | *
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| 29 | * Current restrictions:
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| 30 | * - Max 128 parameters
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| 31 | * - No 'long double' support.
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| 32 | *
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| 33 | * If you ever want truly portable and good *printf() clones, the project that
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| 34 | * took on from here is named 'Trio' and you find more details on the trio web
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| 35 | * page at https://daniel.haxx.se/trio/
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| 36 | */
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| 37 |
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| 38 | /*------------------------------------------------------------------------/
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| 39 | / Universal string handler for user console interface
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| 40 | /-------------------------------------------------------------------------/
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| 41 | /
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| 42 | / Copyright (C) 2011, ChaN, all right reserved.
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| 43 | /
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| 44 | / * This software is a free software and there is NO WARRANTY.
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| 45 | / * No restriction on use. You can use, modify and redistribute it for
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| 46 | / personal, non-profit or commercial products UNDER YOUR RESPONSIBILITY.
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| 47 | / * Redistributions of source code must retain the above copyright notice.
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| 48 | /
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| 49 | /-------------------------------------------------------------------------*/
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| 50 |
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| 51 | #include <stdarg.h>
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| 52 | #include <stdio.h>
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| 53 | #include <string.h>
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| 54 | #include <stdlib.h>
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| 55 |
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| 56 | struct nsprintf {
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| 57 | char *buffer;
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| 58 | size_t length;
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| 59 | size_t max;
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| 60 | };
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| 61 |
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| 62 | struct asprintf {
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| 63 | char *buffer; /* allocated buffer */
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| 64 | size_t len; /* length of string */
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| 65 | size_t alloc; /* length of alloc */
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| 66 | int fail; /* (!= 0) if an alloc has failed and thus
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| 67 | the output is not the complete data */
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| 68 | };
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| 69 |
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| 70 | #define OUTCHAR(x) \
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| 71 | do{ \
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| 72 | if(stream((unsigned char)(x), (FILE *)data) != -1) \
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| 73 | done++; \
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| 74 | else \
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| 75 | return done; /* return immediately on failure */ \
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| 76 | } while(0)
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| 77 |
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| 78 |
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| 79 | static int dprintf_formatf(
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| 80 | void *data,
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| 81 | int(*stream)(int, FILE *),
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| 82 | const char *fmt,
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| 83 | va_list arp)
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| 84 | {
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| 85 | unsigned int r, i, j, w, f;
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| 86 | unsigned long v;
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| 87 | char s[16], c, d, *p;
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| 88 |
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| 89 | /* Number of characters written. */
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| 90 | int done = 0;
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| 91 |
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| 92 | for (;;) {
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| 93 | c = *fmt++; /* Get a char */
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| 94 | if (!c) break; /* End of format? */
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| 95 | if (c != '%') { /* Pass through it if not a % sequense */
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| 96 | OUTCHAR(c); continue;
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| 97 | }
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| 98 | f = 0;
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| 99 | c = *fmt++; /* Get first char of the sequense */
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| 100 | if (c == '0') { /* Flag: '0' padded */
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| 101 | f = 1; c = *fmt++;
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| 102 | }
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| 103 | else {
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| 104 | if (c == '-') { /* Flag: left justified */
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| 105 | f = 2; c = *fmt++;
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| 106 | }
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| 107 | }
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| 108 | for (w = 0; c >= '0' && c <= '9'; c = *fmt++) /* Minimum width */
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| 109 | w = w * 10 + c - '0';
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| 110 | if (c == 'l' || c == 'L') { /* Prefix: Size is long int */
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| 111 | f |= 4; c = *fmt++;
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| 112 | }
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| 113 | else if (c == 'h') { /* Prefix: Size is short int */
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| 114 | f |= 16; c = *fmt++;
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| 115 | }
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| 116 | if (!c) break; /* End of format? */
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| 117 | d = c;
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| 118 | if (d >= 'a') d -= 0x20;
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| 119 | switch (d) { /* Type is... */
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| 120 | case 'S': /* String */
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| 121 | p = va_arg(arp, char*);
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| 122 | for (j = 0; p[j]; j++);
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| 123 | while (!(f & 2) && j++ < w) OUTCHAR(' ');
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| 124 | for (; *p; p++)
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| 125 | OUTCHAR(*p);
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| 126 | while (j++ < w) OUTCHAR(' ');
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| 127 | continue;
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| 128 | case 'C': /* Character */
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| 129 | OUTCHAR((char)va_arg(arp, int)); continue;
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| 130 | case 'B': /* Binary */
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| 131 | r = 2; break;
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| 132 | case 'O': /* Octal */
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| 133 | r = 8; break;
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| 134 | case 'D': /* Signed decimal */
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| 135 | case 'U': /* Unsigned decimal */
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| 136 | r = 10; break;
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| 137 | case 'X': /* Hexdecimal */
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| 138 | r = 16; break;
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| 139 | default: /* Unknown type (passthrough) */
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| 140 | OUTCHAR(c); continue;
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| 141 | }
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| 142 |
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| 143 | /* Get an argument and put it in numeral */
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| 144 | v = (f & 4) ? va_arg(arp, long)
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| 145 | : ((f & 16) ? ((d == 'D') ? (long)va_arg(arp, short) : (long)va_arg(arp, unsigned short))
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| 146 | : ((d == 'D') ? (long)va_arg(arp, int) : (long)va_arg(arp, unsigned int)));
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| 147 | if (d == 'D' && (v & 0x80000000)) {
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| 148 | v = 0 - v;
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| 149 | f |= 8;
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| 150 | }
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| 151 | i = 0;
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| 152 | do {
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| 153 | d = (char)(v % r); v /= r;
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| 154 | if (d > 9) d += (c == 'x') ? 0x27 : 0x07;
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| 155 | s[i++] = d + '0';
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| 156 | } while (v && i < sizeof(s));
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| 157 | if (f & 8) s[i++] = '-';
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| 158 | j = i; d = (f & 1) ? '0' : ' ';
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| 159 | while (!(f & 2) && j++ < w) OUTCHAR(d);
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| 160 | do OUTCHAR(s[--i]); while (i);
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| 161 | while (j++ < w) OUTCHAR(' ');
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| 162 | }
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| 163 | return done;
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| 164 | }
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| 165 | /* fputc() look-alike */
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| 166 | static int addbyter(int output, FILE *data)
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| 167 | {
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| 168 | struct nsprintf *infop=(struct nsprintf *)data;
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| 169 | unsigned char outc = (unsigned char)output;
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| 170 |
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| 171 | if(infop->length < infop->max) {
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| 172 | /* only do this if we haven't reached max length yet */
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| 173 | infop->buffer[0] = outc; /* store */
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| 174 | infop->buffer++; /* increase pointer */
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| 175 | infop->length++; /* we are now one byte larger */
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| 176 | return outc; /* fputc() returns like this on success */
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| 177 | }
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| 178 | return -1;
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| 179 | }
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| 180 |
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| 181 | int vsnprintf(char *buffer, size_t maxlength, const char *format,
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| 182 | va_list ap_save)
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| 183 | {
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| 184 | int retcode;
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| 185 | struct nsprintf info;
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| 186 |
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| 187 | info.buffer = buffer;
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| 188 | info.length = 0;
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| 189 | info.max = maxlength;
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| 190 |
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| 191 | retcode = dprintf_formatf(&info, addbyter, format, ap_save);
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| 192 | if(info.max) {
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| 193 | /* we terminate this with a zero byte */
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| 194 | if(info.max == info.length)
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| 195 | /* we're at maximum, scrap the last letter */
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| 196 | info.buffer[-1] = 0;
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| 197 | else
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| 198 | info.buffer[0] = 0;
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| 199 | }
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| 200 | return retcode;
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| 201 | }
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| 202 |
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| 203 | int snprintf(char *buffer, size_t maxlength, const char *format, ...)
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| 204 | {
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| 205 | int retcode;
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| 206 | va_list ap_save; /* argument pointer */
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| 207 | va_start(ap_save, format);
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| 208 | retcode = vsnprintf(buffer, maxlength, format, ap_save);
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| 209 | va_end(ap_save);
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| 210 | return retcode;
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| 211 | }
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| 212 |
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| 213 | /* fputc() look-alike */
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| 214 | static int alloc_addbyter(int output, FILE *data)
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| 215 | {
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| 216 | struct asprintf *infop=(struct asprintf *)data;
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| 217 | unsigned char outc = (unsigned char)output;
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| 218 |
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| 219 | if(!infop->buffer) {
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| 220 | infop->buffer = malloc(32);
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| 221 | if(!infop->buffer) {
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| 222 | infop->fail = 1;
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| 223 | return -1; /* fail */
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| 224 | }
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| 225 | infop->alloc = 32;
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| 226 | infop->len =0;
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| 227 | }
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| 228 | else if(infop->len+1 >= infop->alloc) {
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| 229 | char *newptr;
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| 230 |
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| 231 | newptr = realloc(infop->buffer, infop->alloc*2);
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| 232 |
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| 233 | if(!newptr) {
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| 234 | infop->fail = 1;
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| 235 | return -1; /* fail */
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| 236 | }
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| 237 | infop->buffer = newptr;
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| 238 | infop->alloc *= 2;
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| 239 | }
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| 240 |
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| 241 | infop->buffer[ infop->len ] = outc;
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| 242 |
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| 243 | infop->len++;
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| 244 |
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| 245 | return outc; /* fputc() returns like this on success */
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| 246 | }
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| 247 |
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| 248 | char *aprintf(const char *format, ...)
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| 249 | {
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| 250 | va_list ap_save; /* argument pointer */
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| 251 | int retcode;
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| 252 | struct asprintf info;
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| 253 |
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| 254 | info.buffer = NULL;
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| 255 | info.len = 0;
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| 256 | info.alloc = 0;
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| 257 | info.fail = 0;
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| 258 |
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| 259 | va_start(ap_save, format);
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| 260 | retcode = dprintf_formatf(&info, alloc_addbyter, format, ap_save);
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| 261 | va_end(ap_save);
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| 262 | if((-1 == retcode) || info.fail) {
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| 263 | if(info.alloc)
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| 264 | free(info.buffer);
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| 265 | return NULL;
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| 266 | }
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| 267 | if(info.alloc) {
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| 268 | info.buffer[info.len] = 0; /* we terminate this with a zero byte */
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| 269 | return info.buffer;
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| 270 | }
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| 271 | else
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| 272 | return strdup("");
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| 273 | }
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| 274 |
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| 275 | char *vaprintf(const char *format, va_list ap_save)
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| 276 | {
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| 277 | int retcode;
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| 278 | struct asprintf info;
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| 279 |
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| 280 | info.buffer = NULL;
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| 281 | info.len = 0;
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| 282 | info.alloc = 0;
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| 283 | info.fail = 0;
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| 284 |
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| 285 | retcode = dprintf_formatf(&info, alloc_addbyter, format, ap_save);
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| 286 | if((-1 == retcode) || info.fail) {
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| 287 | if(info.alloc)
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| 288 | free(info.buffer);
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| 289 | return NULL;
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| 290 | }
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| 291 |
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| 292 | if(info.alloc) {
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| 293 | info.buffer[info.len] = 0; /* we terminate this with a zero byte */
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| 294 | return info.buffer;
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| 295 | }
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| 296 | else
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| 297 | return strdup("");
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| 298 | }
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| 299 |
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| 300 | int vasprintf(char **dst, const char *format, va_list ap_save)
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| 301 | {
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| 302 | int retcode;
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| 303 | struct asprintf info;
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| 304 |
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| 305 | info.buffer = NULL;
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| 306 | info.len = 0;
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| 307 | info.alloc = 0;
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| 308 | info.fail = 0;
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| 309 |
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| 310 | retcode = dprintf_formatf(&info, alloc_addbyter, format, ap_save);
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| 311 | if ((-1 == retcode) || info.fail) {
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| 312 | if (info.alloc)
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| 313 | free(info.buffer);
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| 314 | return -1;
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| 315 | }
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| 316 |
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| 317 | if (info.alloc) {
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| 318 | info.buffer[info.len] = 0; /* we terminate this with a zero byte */
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| 319 | *dst = info.buffer;
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| 320 | return info.len;
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| 321 | }
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| 322 | else {
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| 323 | *dst = strdup("");
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| 324 | return 0;
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| 325 | }
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| 326 | }
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| 327 |
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| 328 | static int storebuffer(int output, FILE *data)
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| 329 | {
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| 330 | char **buffer = (char **)data;
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| 331 | unsigned char outc = (unsigned char)output;
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| 332 | **buffer = outc;
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| 333 | (*buffer)++;
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| 334 | return outc; /* act like fputc() ! */
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| 335 | }
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| 336 |
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| 337 | int sprintf(char *buffer, const char *format, ...)
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| 338 | {
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| 339 | va_list ap_save; /* argument pointer */
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| 340 | int retcode;
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| 341 | va_start(ap_save, format);
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| 342 | retcode = dprintf_formatf(&buffer, storebuffer, format, ap_save);
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| 343 | va_end(ap_save);
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| 344 | *buffer=0; /* we terminate this with a zero byte */
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| 345 | return retcode;
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| 346 | }
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| 347 |
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| 348 | int printf(const char *format, ...)
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| 349 | {
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| 350 | int retcode;
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| 351 | va_list ap_save; /* argument pointer */
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| 352 | va_start(ap_save, format);
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| 353 |
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| 354 | retcode = dprintf_formatf(stdout, fputc, format, ap_save);
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| 355 | va_end(ap_save);
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| 356 | return retcode;
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| 357 | }
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| 358 |
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| 359 | int fprintf(FILE *whereto, const char *format, ...)
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| 360 | {
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| 361 | int retcode;
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| 362 | va_list ap_save; /* argument pointer */
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| 363 | va_start(ap_save, format);
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| 364 | retcode = dprintf_formatf(whereto, fputc, format, ap_save);
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| 365 | va_end(ap_save);
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| 366 | return retcode;
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| 367 | }
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| 368 |
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| 369 | int vsprintf(char *buffer, const char *format, va_list ap_save)
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| 370 | {
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| 371 | int retcode;
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| 372 | retcode = dprintf_formatf(&buffer, storebuffer, format, ap_save);
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| 373 | *buffer=0; /* we terminate this with a zero byte */
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| 374 | return retcode;
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| 375 | }
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| 376 |
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| 377 | int vprintf(const char *format, va_list ap_save)
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| 378 | {
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| 379 | return dprintf_formatf(stdout, fputc, format, ap_save);
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| 380 | }
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| 381 |
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| 382 | int vfprintf(FILE *whereto, const char *format, va_list ap_save)
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| 383 | {
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| 384 | return dprintf_formatf(whereto, fputc, format, ap_save);
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| 385 | }
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