release/src/router/libncurses/ncurses/tinfo/comp_expand.c

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  28
  29 /****************************************************************************
  30  *  Author: Thomas E. Dickey <dickey@clark.net> 1998                        *
  31  ****************************************************************************/
  32
  33 #include <curses.priv.h>
  34
  35 #include <ctype.h>
  36 #include <tic.h>
  37
  38 MODULE_ID("$Id: comp_expand.c,v 1.21 2010/01/16 17:11:23 tom Exp $")
  39
  40 static int
  41 trailing_spaces(const char *src)
  42 {
  43     while (*src == ' ')
  44         src++;
  45     return *src == 0;
  46 }
  47
  48 /* this deals with differences over whether 0x7f and 0x80..0x9f are controls */
  49 #define REALCTL(s) (UChar(*(s)) < 127 && iscntrl(UChar(*(s))))
  50 #define REALPRINT(s) (UChar(*(s)) < 127 && isprint(UChar(*(s))))
  51
  52 NCURSES_EXPORT(char *)
  53 _nc_tic_expand(const char *srcp, bool tic_format, int numbers)
  54 {
  55     static char *buffer;
  56     static size_t length;
  57
  58     int bufp;
  59     const char *str = VALID_STRING(srcp) ? srcp : "\0\0";
  60     bool islong = (strlen(str) > 3);
  61     size_t need = (2 + strlen(str)) * 4;
  62     int ch;
  63
  64 #if NO_LEAKS
  65     if (srcp == 0) {
  66         if (buffer != 0) {
  67             FreeAndNull(buffer);
  68             length = 0;
  69         }
  70         return 0;
  71     }
  72 #endif
  73     if (buffer == 0 || need > length) {
  74         if ((buffer = typeRealloc(char, length = need, buffer)) == 0)
  75               return 0;
  76     }
  77
  78     bufp = 0;
  79     while ((ch = UChar(*str)) != 0) {
  80         if (ch == '%' && REALPRINT(str + 1)) {
  81             buffer[bufp++] = *str++;
  82             /*
  83              * Though the character literals are more compact, most
  84              * terminal descriptions use numbers and are not easy
  85              * to read in character-literal form.
  86              */
  87             switch (numbers) {
  88             case -1:
  89                 if (str[0] == S_QUOTE
  90                     && str[1] != '\\'
  91                     && REALPRINT(str + 1)
  92                     && str[2] == S_QUOTE) {
  93                     sprintf(buffer + bufp, "{%d}", str[1]);
  94                     bufp += (int) strlen(buffer + bufp);
  95                     str += 2;
  96                 } else {
  97                     buffer[bufp++] = *str;
  98                 }
  99                 break;
 100                 /*
 101                  * If we have a "%{number}", try to translate it into
 102                  * a "%'char'" form, since that will run a little faster
 103                  * when we're interpreting it.  Also, having one form
 104                  * for the constant makes it simpler to compare terminal
 105                  * descriptions.
 106                  */
 107             case 1:
 108                 if (str[0] == L_BRACE
 109                     && isdigit(UChar(str[1]))) {
 110                     char *dst = 0;
 111                     long value = strtol(str + 1, &dst, 0);
 112                     if (dst != 0
 113                         && *dst == R_BRACE
 114                         && value < 127
 115                         && value != '\\'        /* FIXME */
 116                         && isprint((int) value)) {
 117                         ch = (int) value;
 118                         buffer[bufp++] = S_QUOTE;
 119                         if (ch == '\\'
 120                             || ch == S_QUOTE)
 121                             buffer[bufp++] = '\\';
 122                         buffer[bufp++] = (char) ch;
 123                         buffer[bufp++] = S_QUOTE;
 124                         str = dst;
 125                     } else {
 126                         buffer[bufp++] = *str;
 127                     }
 128                 } else {
 129                     buffer[bufp++] = *str;
 130                 }
 131                 break;
 132             default:
 133                 buffer[bufp++] = *str;
 134                 break;
 135             }
 136         } else if (ch == 128) {
 137             buffer[bufp++] = '\\';
 138             buffer[bufp++] = '0';
 139         } else if (ch == '\033') {
 140             buffer[bufp++] = '\\';
 141             buffer[bufp++] = 'E';
 142         } else if (ch == '\\' && tic_format && (str == srcp || str[-1] != '^')) {
 143             buffer[bufp++] = '\\';
 144             buffer[bufp++] = '\\';
 145         } else if (ch == ' ' && tic_format && (str == srcp ||
 146                                                trailing_spaces(str))) {
 147             buffer[bufp++] = '\\';
 148             buffer[bufp++] = 's';
 149         } else if ((ch == ',' || ch == ':' || ch == '^') && tic_format) {
 150             buffer[bufp++] = '\\';
 151             buffer[bufp++] = (char) ch;
 152         } else if (REALPRINT(str)
 153                    && (ch != ','
 154                        && ch != ':'
 155                        && !(ch == '!' && !tic_format)
 156                        && ch != '^'))
 157             buffer[bufp++] = (char) ch;
 158 #if 0                           /* FIXME: this would be more readable (in fact the whole 'islong' logic should be removed) */
 159         else if (ch == '\b') {
 160             buffer[bufp++] = '\\';
 161             buffer[bufp++] = 'b';
 162         } else if (ch == '\f') {
 163             buffer[bufp++] = '\\';
 164             buffer[bufp++] = 'f';
 165         } else if (ch == '\t' && islong) {
 166             buffer[bufp++] = '\\';
 167             buffer[bufp++] = 't';
 168         }
 169 #endif
 170         else if (ch == '\r' && (islong || (strlen(srcp) > 2 && str[1] == '\0'))) {
 171             buffer[bufp++] = '\\';
 172             buffer[bufp++] = 'r';
 173         } else if (ch == '\n' && islong) {
 174             buffer[bufp++] = '\\';
 175             buffer[bufp++] = 'n';
 176         }
 177 #define UnCtl(c) ((c) + '@')
 178         else if (REALCTL(str) && ch != '\\'
 179                  && (!islong || isdigit(UChar(str[1])))) {
 180             (void) sprintf(&buffer[bufp], "^%c", UnCtl(ch));
 181             bufp += 2;
 182         } else {
 183             (void) sprintf(&buffer[bufp], "\\%03o", ch);
 184             bufp += 4;
 185         }
 186
 187         str++;
 188     }
 189
 190     buffer[bufp] = '\0';
 191     return (buffer);
 192 }