scheduler/util.c

   1 /*
   2  * "$Id: util.c 6535 2007-05-16 20:35:05Z mike $"
   3  *
   4  *   Mini-daemon utility functions for the Common UNIX Printing System (CUPS).
   5  *
   6  *   Copyright 1997-2005 by Easy Software Products.
   7  *
   8  *   These coded instructions, statements, and computer programs are the
   9  *   property of Easy Software Products and are protected by Federal
  10  *   copyright law.  Distribution and use rights are outlined in the file
  11  *   "LICENSE.txt" which should have been included with this file.  If this
  12  *   file is missing or damaged please contact Easy Software Products
  13  *   at:
  14  *
  15  *       Attn: CUPS Licensing Information
  16  *       Easy Software Products
  17  *       44141 Airport View Drive, Suite 204
  18  *       Hollywood, Maryland 20636 USA
  19  *
  20  *       Voice: (301) 373-9600
  21  *       EMail: cups-info@cups.org
  22  *         WWW: http://www.cups.org
  23  *
  24  * Contents:
  25  *
  26  *   cupsdCompareNames()   - Compare two names.
  27  *   cupsdSendIPPGroup()   - Send a group tag.
  28  *   cupsdSendIPPHeader()  - Send the IPP response header.
  29  *   cupsdSendIPPInteger() - Send an integer attribute.
  30  *   cupsdSendIPPString()  - Send a string attribute.
  31  *   cupsdSendIPPTrailer() - Send the end-of-message tag.
  32  */
  33
  34 /*
  35  * Include necessary headers...
  36  */
  37
  38 #include "util.h"
  39
  40
  41 /*
  42  * 'cupsdCompareNames()' - Compare two names.
  43  *
  44  * This function basically does a strcasecmp() of the two strings,
  45  * but is also aware of numbers so that "a2" < "a100".
  46  */
  47
  48 int                                     /* O - Result of comparison */
  49 cupsdCompareNames(const char *s,        /* I - First string */
  50                   const char *t)        /* I - Second string */
  51 {
  52   int           diff,                   /* Difference between digits */
  53                 digits;                 /* Number of digits */
  54
  55
  56  /*
  57   * Loop through both names, returning only when a difference is
  58   * seen.  Also, compare whole numbers rather than just characters, too!
  59   */
  60
  61   while (*s && *t)
  62   {
  63     if (isdigit(*s & 255) && isdigit(*t & 255))
  64     {
  65      /*
  66       * Got a number; start by skipping leading 0's...
  67       */
  68
  69       while (*s == '0')
  70         s ++;
  71       while (*t == '0')
  72         t ++;
  73
  74      /*
  75       * Skip equal digits...
  76       */
  77
  78       while (isdigit(*s & 255) && *s == *t)
  79       {
  80         s ++;
  81         t ++;
  82       }
  83
  84      /*
  85       * Bounce out if *s and *t aren't both digits...
  86       */
  87
  88       if (isdigit(*s & 255) && !isdigit(*t & 255))
  89         return (1);
  90       else if (!isdigit(*s & 255) && isdigit(*t & 255))
  91         return (-1);
  92       else if (!isdigit(*s & 255) || !isdigit(*t & 255))
  93         continue;
  94
  95       if (*s < *t)
  96         diff = -1;
  97       else
  98         diff = 1;
  99
 100      /*
 101       * Figure out how many more digits there are...
 102       */
 103
 104       digits = 0;
 105       s ++;
 106       t ++;
 107
 108       while (isdigit(*s & 255))
 109       {
 110         digits ++;
 111         s ++;
 112       }
 113
 114       while (isdigit(*t & 255))
 115       {
 116         digits --;
 117         t ++;
 118       }
 119
 120      /*
 121       * Return if the number or value of the digits is different...
 122       */
 123
 124       if (digits < 0)
 125         return (-1);
 126       else if (digits > 0)
 127         return (1);
 128       else if (diff)
 129         return (diff);
 130     }
 131     else if (tolower(*s) < tolower(*t))
 132       return (-1);
 133     else if (tolower(*s) > tolower(*t))
 134       return (1);
 135     else
 136     {
 137       s ++;
 138       t ++;
 139     }
 140   }
 141
 142  /*
 143   * Return the results of the final comparison...
 144   */
 145
 146   if (*s)
 147     return (1);
 148   else if (*t)
 149     return (-1);
 150   else
 151     return (0);
 152 }
 153
 154
 155 /*
 156  * 'cupsdSendIPPGroup()' - Send a group tag.
 157  */
 158
 159 void
 160 cupsdSendIPPGroup(ipp_tag_t group_tag)  /* I - Group tag */
 161 {
 162  /*
 163   * Send IPP group tag (1 byte)...
 164   */
 165
 166   putchar(group_tag);
 167 }
 168
 169
 170 /*
 171  * 'cupsdSendIPPHeader()' - Send the IPP response header.
 172  */
 173
 174 void
 175 cupsdSendIPPHeader(
 176     ipp_status_t status_code,           /* I - Status code */
 177     int          request_id)            /* I - Request ID */
 178 {
 179  /*
 180   * Send IPP/1.1 response header: version number (2 bytes), status code
 181   * (2 bytes), and request ID (4 bytes)...
 182   */
 183
 184   putchar(1);
 185   putchar(1);
 186
 187   putchar(status_code >> 8);
 188   putchar(status_code);
 189
 190   putchar(request_id >> 24);
 191   putchar(request_id >> 16);
 192   putchar(request_id >> 8);
 193   putchar(request_id);
 194 }
 195
 196
 197 /*
 198  * 'cupsdSendIPPInteger()' - Send an integer attribute.
 199  */
 200
 201 void
 202 cupsdSendIPPInteger(
 203     ipp_tag_t  value_tag,               /* I - Value tag */
 204     const char *name,                   /* I - Attribute name */
 205     int        value)                   /* I - Attribute value */
 206 {
 207   size_t        len;                    /* Length of attribute name */
 208
 209
 210  /*
 211   * Send IPP integer value: value tag (1 byte), name length (2 bytes),
 212   * name string (without nul), value length (2 bytes), and value (4 bytes)...
 213   */
 214
 215   putchar(value_tag);
 216
 217   len = strlen(name);
 218   putchar(len >> 8);
 219   putchar(len);
 220
 221   fputs(name, stdout);
 222
 223   putchar(0);
 224   putchar(4);
 225
 226   putchar(value >> 24);
 227   putchar(value >> 16);
 228   putchar(value >> 8);
 229   putchar(value);
 230 }
 231
 232
 233 /*
 234  * 'cupsdSendIPPString()' - Send a string attribute.
 235  */
 236
 237 void
 238 cupsdSendIPPString(
 239     ipp_tag_t  value_tag,               /* I - Value tag */
 240     const char *name,                   /* I - Attribute name */
 241     const char *value)                  /* I - Attribute value */
 242 {
 243   size_t        len;                    /* Length of attribute name */
 244
 245
 246  /*
 247   * Send IPP string value: value tag (1 byte), name length (2 bytes),
 248   * name string (without nul), value length (2 bytes), and value string
 249   * (without nul)...
 250   */
 251
 252   putchar(value_tag);
 253
 254   len = strlen(name);
 255   putchar(len >> 8);
 256   putchar(len);
 257
 258   fputs(name, stdout);
 259
 260   len = strlen(value);
 261   putchar(len >> 8);
 262   putchar(len);
 263
 264   fputs(value, stdout);
 265 }
 266
 267
 268 /*
 269  * 'cupsdSendIPPTrailer()' - Send the end-of-message tag.
 270  */
 271
 272 void
 273 cupsdSendIPPTrailer(void)
 274 {
 275   putchar(IPP_TAG_END);
 276   fflush(stdout);
 277 }
 278
 279
 280 /*
 281  * End of "$Id: util.c 6535 2007-05-16 20:35:05Z mike $".
 282  */