contrib/less/lessecho.c

   1 /*
   2  * Copyright (C) 1984-2011  Mark Nudelman
   3  *
   4  * You may distribute under the terms of either the GNU General Public
   5  * License or the Less License, as specified in the README file.
   6  *
   7  * For more information about less, or for information on how to
   8  * contact the author, see the README file.
   9  */
  10
  11
  12 /*
  13  * lessecho [-ox] [-cx] [-pn] [-dn] [-a] file ...
  14  * Simply echos its filename arguments on standard output.
  15  * But any argument containing spaces is enclosed in quotes.
  16  *
  17  * -ox  Specifies "x" to be the open quote character.
  18  * -cx  Specifies "x" to be the close quote character.
  19  * -pn  Specifies "n" to be the open quote character, as an integer.
  20  * -dn  Specifies "n" to be the close quote character, as an integer.
  21  * -mx  Specifies "x" to be a metachar.
  22  * -nn  Specifies "n" to be a metachar, as an integer.
  23  * -ex  Specifies "x" to be the escape char for metachars.
  24  * -fn  Specifies "x" to be the escape char for metachars, as an integer.
  25  * -a   Specifies that all arguments are to be quoted.
  26  *      The default is that only arguments containing spaces are quoted.
  27  */
  28
  29 #include "less.h"
  30
  31 static char *version = "$Revision: 1.14 $";
  32
  33 static int quote_all = 0;
  34 static char openquote = '"';
  35 static char closequote = '"';
  36 static char *meta_escape = "\\";
  37 static char meta_escape_buf[2];
  38 static char metachars[64] = "";
  39 static int num_metachars = 0;
  40
  41         static void
  42 pr_usage()
  43 {
  44         fprintf(stderr,
  45                 "usage: lessecho [-ox] [-cx] [-pn] [-dn] [-mx] [-nn] [-ex] [-fn] [-a] file ...\n");
  46 }
  47
  48         static void
  49 pr_version()
  50 {
  51         char *p;
  52         char buf[10];
  53         char *pbuf = buf;
  54
  55         for (p = version;  *p != ' ';  p++)
  56                 if (*p == '\0')
  57                         return;
  58         for (p++;  *p != '$' && *p != ' ' && *p != '\0';  p++)
  59                 *pbuf++ = *p;
  60         *pbuf = '\0';
  61         printf("%s\n", buf);
  62 }
  63
  64         static void
  65 pr_error(s)
  66         char *s;
  67 {
  68         fprintf(stderr, "%s\n", s);
  69         exit(1);
  70 }
  71
  72         static long
  73 lstrtol(s, radix, pend)
  74         char *s;
  75         int radix;
  76         char **pend;
  77 {
  78         int v;
  79         int neg = 0;
  80         long n = 0;
  81
  82         /* Skip leading white space. */
  83         while (*s == ' ' || *s == '\t')
  84                 s++;
  85
  86         /* Check for a leading + or -. */
  87         if (*s == '-')
  88         {
  89                 neg = 1;
  90                 s++;
  91         } else if (*s == '+')
  92         {
  93                 s++;
  94         }
  95
  96         /* Determine radix if caller does not specify. */
  97         if (radix == 0)
  98         {
  99                 radix = 10;
 100                 if (*s == '0')
 101                 {
 102                         switch (*++s)
 103                         {
 104                         case 'x':
 105                                 radix = 16;
 106                                 s++;
 107                                 break;
 108                         default:
 109                                 radix = 8;
 110                                 break;
 111                         }
 112                 }
 113         }
 114
 115         /* Parse the digits of the number. */
 116         for (;;)
 117         {
 118                 if (*s >= '0' && *s <= '9')
 119                         v = *s - '0';
 120                 else if (*s >= 'a' && *s <= 'f')
 121                         v = *s - 'a' + 10;
 122                 else if (*s >= 'A' && *s <= 'F')
 123                         v = *s - 'A' + 10;
 124                 else
 125                         break;
 126                 if (v >= radix)
 127                         break;
 128                 n = n * radix + v;
 129                 s++;
 130         }
 131
 132         if (pend != NULL)
 133         {
 134                 /* Skip trailing white space. */
 135                 while (*s == ' ' || *s == '\t')
 136                         s++;
 137                 *pend = s;
 138         }
 139         if (neg)
 140                 return (-n);
 141         return (n);
 142 }
 143
 144
 145 #if !HAVE_STRCHR
 146         char *
 147 strchr(s, c)
 148         char *s;
 149         int c;
 150 {
 151         for ( ;  *s != '\0';  s++)
 152                 if (*s == c)
 153                         return (s);
 154         if (c == '\0')
 155                 return (s);
 156         return (NULL);
 157 }
 158 #endif
 159
 160         int
 161 main(argc, argv)
 162         int argc;
 163         char *argv[];
 164 {
 165         char *arg;
 166         char *s;
 167         int no_more_options;
 168
 169         no_more_options = 0;
 170         while (--argc > 0)
 171         {
 172                 arg = *++argv;
 173                 if (*arg != '-' || no_more_options)
 174                         break;
 175                 switch (*++arg)
 176                 {
 177                 case 'a':
 178                         quote_all = 1;
 179                         break;
 180                 case 'c':
 181                         closequote = *++arg;
 182                         break;
 183                 case 'd':
 184                         closequote = lstrtol(++arg, 0, &s);
 185                         if (s == arg)
 186                                 pr_error("Missing number after -d");
 187                         break;
 188                 case 'e':
 189                         if (strcmp(++arg, "-") == 0)
 190                                 meta_escape = "";
 191                         else
 192                                 meta_escape = arg;
 193                         break;
 194                 case 'f':
 195                         meta_escape_buf[0] = lstrtol(++arg, 0, &s);
 196                         meta_escape = meta_escape_buf;
 197                         if (s == arg)
 198                                 pr_error("Missing number after -f");
 199                         break;
 200                 case 'o':
 201                         openquote = *++arg;
 202                         break;
 203                 case 'p':
 204                         openquote = lstrtol(++arg, 0, &s);
 205                         if (s == arg)
 206                                 pr_error("Missing number after -p");
 207                         break;
 208                 case 'm':
 209                         metachars[num_metachars++] = *++arg;
 210                         metachars[num_metachars] = '\0';
 211                         break;
 212                 case 'n':
 213                         metachars[num_metachars++] = lstrtol(++arg, 0, &s);
 214                         if (s == arg)
 215                                 pr_error("Missing number after -n");
 216                         metachars[num_metachars] = '\0';
 217                         break;
 218                 case '?':
 219                         pr_usage();
 220                         return (0);
 221                 case '-':
 222                         if (*++arg == '\0')
 223                         {
 224                                 no_more_options = 1;
 225                                 break;
 226                         }
 227                         if (strcmp(arg, "version") == 0)
 228                         {
 229                                 pr_version();
 230                                 return (0);
 231                         }
 232                         if (strcmp(arg, "help") == 0)
 233                         {
 234                                 pr_usage();
 235                                 return (0);
 236                         }
 237                         pr_error("Invalid option after --");
 238                 default:
 239                         pr_error("Invalid option letter");
 240                 }
 241         }
 242
 243         while (argc-- > 0)
 244         {
 245                 int has_meta = 0;
 246                 arg = *argv++;
 247                 for (s = arg;  *s != '\0';  s++)
 248                 {
 249                         if (strchr(metachars, *s) != NULL)
 250                         {
 251                                 has_meta = 1;
 252                                 break;
 253                         }
 254                 }
 255                 if (quote_all || (has_meta && strlen(meta_escape) == 0))
 256                         printf("%c%s%c", openquote, arg, closequote);
 257                 else
 258                 {
 259                         for (s = arg;  *s != '\0';  s++)
 260                         {
 261                                 if (strchr(metachars, *s) != NULL)
 262                                         printf("%s", meta_escape);
 263                                 printf("%c", *s);
 264                         }
 265                 }
 266                 if (argc > 0)
 267                         printf(" ");
 268                 else
 269                         printf("\n");
 270         }
 271         return (0);
 272 }