out.c

   1 /*      $Id: out.c,v 1.7 2009/10/22 18:59:00 kristaps Exp $ */
   2 /*
   3  * Copyright (c) 2009 Kristaps Dzonsons <kristaps@kth.se>
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17 #include <sys/types.h>
  18
  19 #include <assert.h>
  20 #include <ctype.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <time.h>
  25
  26 #include "out.h"
  27
  28 #ifdef __linux__
  29 extern  size_t    strlcat(char *, const char *, size_t);
  30 #endif
  31
  32 /*
  33  * Convert a `scaling unit' to a consistent form, or fail.  Scaling
  34  * units are documented in groff.7, mdoc.7, man.7.
  35  */
  36 int
  37 a2roffsu(const char *src, struct roffsu *dst, enum roffscale def)
  38 {
  39         char             buf[BUFSIZ], hasd;
  40         int              i;
  41         enum roffscale   unit;
  42
  43         if ('\0' == *src)
  44                 return(0);
  45
  46         i = hasd = 0;
  47
  48         switch (*src) {
  49         case ('+'):
  50                 src++;
  51                 break;
  52         case ('-'):
  53                 buf[i++] = *src++;
  54                 break;
  55         default:
  56                 break;
  57         }
  58
  59         if ('\0' == *src)
  60                 return(0);
  61
  62         while (i < BUFSIZ) {
  63                 if ( ! isdigit((u_char)*src)) {
  64                         if ('.' != *src)
  65                                 break;
  66                         else if (hasd)
  67                                 break;
  68                         else
  69                                 hasd = 1;
  70                 }
  71                 buf[i++] = *src++;
  72         }
  73
  74         if (BUFSIZ == i || (*src && *(src + 1)))
  75                 return(0);
  76
  77         buf[i] = '\0';
  78
  79         switch (*src) {
  80         case ('c'):
  81                 unit = SCALE_CM;
  82                 break;
  83         case ('i'):
  84                 unit = SCALE_IN;
  85                 break;
  86         case ('P'):
  87                 unit = SCALE_PC;
  88                 break;
  89         case ('p'):
  90                 unit = SCALE_PT;
  91                 break;
  92         case ('f'):
  93                 unit = SCALE_FS;
  94                 break;
  95         case ('v'):
  96                 unit = SCALE_VS;
  97                 break;
  98         case ('m'):
  99                 unit = SCALE_EM;
 100                 break;
 101         case ('\0'):
 102                 if (SCALE_MAX == def)
 103                         return(0);
 104                 unit = SCALE_BU;
 105                 break;
 106         case ('u'):
 107                 unit = SCALE_BU;
 108                 break;
 109         case ('M'):
 110                 unit = SCALE_MM;
 111                 break;
 112         case ('n'):
 113                 unit = SCALE_EN;
 114                 break;
 115         default:
 116                 return(0);
 117         }
 118
 119         if ((dst->scale = atof(buf)) < 0)
 120                 dst->scale = 0;
 121         dst->unit = unit;
 122         dst->pt = hasd;
 123
 124         return(1);
 125 }
 126
 127
 128 /*
 129  * Correctly writes the time in nroff form, which differs from standard
 130  * form in that a space isn't printed in lieu of the extra %e field for
 131  * single-digit dates.
 132  */
 133 void
 134 time2a(time_t t, char *dst, size_t sz)
 135 {
 136         struct tm        tm;
 137         char             buf[5];
 138         char            *p;
 139         size_t           nsz;
 140
 141         assert(sz > 1);
 142         localtime_r(&t, &tm);
 143
 144         p = dst;
 145         nsz = 0;
 146
 147         dst[0] = '\0';
 148
 149         if (0 == (nsz = strftime(p, sz, "%B ", &tm)))
 150                 return;
 151
 152         p += (int)nsz;
 153         sz -= nsz;
 154
 155         if (0 == strftime(buf, sizeof(buf), "%e, ", &tm))
 156                 return;
 157
 158         nsz = strlcat(p, buf + (' ' == buf[0] ? 1 : 0), sz);
 159
 160         if (nsz >= sz)
 161                 return;
 162
 163         p += (int)nsz;
 164         sz -= nsz;
 165
 166         (void)strftime(p, sz, "%Y", &tm);
 167 }
 168