4.3BSD - /usr/src/new/mh/miscellany/less/prompt.c

   1: /*
   2:  * Prompting and other messages.
   3:  * There are three flavors of prompts, SHORT, MEDIUM and LONG,
   4:  * selected by the -m/-M options.
   5:  * A prompt is either a colon or a message composed of various
   6:  * pieces, such as the name of the file being viewed, the percentage
   7:  * into the file, etc.
   8:  */
   9: 
  10: #include "less.h"
  11: #include "position.h"
  12: 
  13: extern int pr_type;
  14: extern int ispipe;
  15: extern int hit_eof;
  16: extern int new_file;
  17: extern int sc_width;
  18: extern char current_file[];
  19: extern int ac;
  20: extern char **av;
  21: extern int curr_ac;
  22: 
  23: static char message[500];
  24: 
  25: /*
  26:  * Append the name of the current file (to the message buffer).
  27:  */
  28:     static void
  29: ap_filename()
  30: {
  31:     if (!ispipe)
  32:         sprintf(message + strlen(message),
  33:             "%s", current_file);
  34: }
  35: 
  36: /*
  37:  * Append the "file N of M" message.
  38:  */
  39:     static void
  40: ap_of()
  41: {
  42:     if (ac > 1)
  43:         sprintf(message + strlen(message),
  44:             " (file %d of %d)", curr_ac+1, ac);
  45: }
  46: 
  47: /*
  48:  * Append the byte offset into the current file.
  49:  */
  50:     static void
  51: ap_byte()
  52: {
  53:     POSITION pos, len;
  54: 
  55:     pos = position(BOTTOM_PLUS_ONE);
  56:     if (pos != NULL_POSITION)
  57:     {
  58:         sprintf(message + strlen(message),
  59:             " byte %ld", pos);
  60:         len = ch_length();
  61:         if (len > 0)
  62:             sprintf(message + strlen(message),
  63:                 "/%ld", len);
  64:     }
  65: }
  66: 
  67: /*
  68:  * Append the percentage into the current file.
  69:  * If we cannot find the percentage and must_print is true,
  70:  * the use the byte offset.
  71:  */
  72:     static void
  73: ap_percent(must_print)
  74: {
  75:     POSITION pos,len;
  76: 
  77:     pos = position(BOTTOM_PLUS_ONE);
  78:     len = ch_length();
  79:     if (len > 0 && pos != NULL_POSITION)
  80:         sprintf(message + strlen(message),
  81:             " (%ld%%)", (100 * pos) / len);
  82:     else if (must_print)
  83:         ap_byte();
  84: }
  85: 
  86: /*
  87:  * Append the end-of-file message.
  88:  */
  89:     static void
  90: ap_eof()
  91: {
  92:     strcat(message, " END");
  93:     if (curr_ac + 1 < ac)
  94:         sprintf(message + strlen(message),
  95:             " - Next: %s", av[curr_ac+1]);
  96: }
  97: 
  98: /*
  99:  * Return a message suitable for printing by the "=" command.
 100:  */
 101:     public char *
 102: eq_message()
 103: {
 104:     message[0] = '\0';
 105:     ap_filename();
 106:     ap_of();
 107:     ap_byte();
 108:     ap_percent(0);
 109:     /*
 110: 	 * Truncate to the screen width.
 111: 	 * {{ This isn't very nice. }}
 112: 	 */
 113:     message[error_width()] = '\0';
 114:     return (message);
 115: }
 116: 
 117: /*
 118:  * Return a prompt.
 119:  * This depends on the prompt type (SHORT, MEDIUM, LONG), etc.
 120:  * If we can't come up with an appropriate prompt, return NULL
 121:  * and the caller will prompt with a colon.
 122:  */
 123:     public char *
 124: pr_string()
 125: {
 126:     message[0] = '\0';
 127:     switch (pr_type)
 128:     {
 129:     case PR_SHORT:
 130:         if (new_file)
 131:         {
 132:             ap_filename();
 133:             ap_of();
 134:         }
 135:         if (hit_eof)
 136:             ap_eof();
 137:         break;
 138:     case PR_MEDIUM:
 139:         if (new_file)
 140:         {
 141:             ap_filename();
 142:             ap_of();
 143:         }
 144:         if (hit_eof)
 145:             ap_eof();
 146:         else
 147:             ap_percent(1);
 148:         break;
 149:     case PR_LONG:
 150:         ap_filename();
 151:         if (new_file)
 152:             ap_of();
 153:         ap_byte();
 154:         if (hit_eof)
 155:             ap_eof();
 156:         else
 157:             ap_percent(0);
 158:         break;
 159:     }
 160:     new_file = 0;
 161:     if (message[0] == '\0')
 162:         return (NULL);
 163:     /*
 164: 	 * Truncate to the screen width.
 165: 	 * {{ This isn't very nice. }}
 166: 	 */
 167:     message[sc_width-2] = '\0';
 168:     return (message);
 169: }

Defined functions

Defined variables