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Annotation of 43BSDReno/usr.bin/tn3270/distribution/utilities/cross.c, revision 1.1.1.1

1.1       root        1: /*
                      2:         This program is, essentially, a cross product generator.  It takes
                      3:         an input file which is said to consist of a number of lines, and
                      4:         expands each line.  A line like
                      5:                 (a,b)(c,d)
                      6:         will be expanded to lines like
                      7:                 ac
                      8:                 ad
                      9:                 bc
                     10:                 bd
                     11:         (without regard for the ORDER of the output; ie: the lines can appear
                     12:         in any order).
                     13: 
                     14:         Parenthesis can be nested, so
                     15:                 (a,b)(c(d,e),f)
                     16:         will produce
                     17:                 acd
                     18:                 ace
                     19:                 af
                     20:                 bcd
                     21:                 bce
                     22:                 bf
                     23:  */
                     24: 
                     25: 
                     26: #include <stdio.h>
                     27: 
                     28: char leftParen,                         /* The left parenthesis character */
                     29:         rightParen;                     /* The right parenthesis character */
                     30: 
                     31: 
                     32: /* Finds next occurrence of 'character' at this level of nesting.
                     33:         Returns 0 if no such character found.
                     34:  */
                     35: 
                     36: char *
                     37: ThisLevel(string, character)
                     38: char *string, character;
                     39: {
                     40:         int level;                      /* Level 0 is OUR level */
                     41: 
                     42:         level = 0;
                     43: 
                     44:         while (*string != '\0') {
                     45:                 if (*string == leftParen)
                     46:                         level++;
                     47:                 else if (*string == rightParen) {
                     48:                         level--;
                     49:                         if (level < 0)
                     50:                                 return(0);
                     51:                 }
                     52:                 if ((level == 0) && (*string == character))
                     53:                                 return(string);
                     54:                 string++;
                     55:         }

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