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Annotation of coherent/d/bin/bc/getnum.xxx, revision 1.1.1.1

1.1       root        1: #include <stdio.h>
                      2: #include <ctype.h>
                      3: #include "bc.h"
                      4: 
                      5: 
                      6: /*
                      7:  *     Getnum reads in a number from standard input.  It allows
                      8:  *     decimal points and sets the scale field of the number accordingly.
                      9:  *     In addition, although the default base is ibase, it recognizes
                     10:  *     the C conventions of leading `0' for base 8 and `0x' for base
                     11:  *     16.
                     12:  */
                     13: 
                     14: rvalue *
                     15: getnum(ch)
                     16: register int   ch;
                     17: {
                     18:        register rvalue *result;
                     19:        register FILE   *inf = infile;
                     20:        mint    dig;
                     21:        int     val,
                     22:                dot,
                     23:                base = ibase;
                     24: 
                     25:        result = (rvalue *)mpalc(sizeof *result);
                     26:        newscalar(result);
                     27:        minit(&dig);
                     28:        if (ch == '0' && (ch = getc(inf)) != '.')
                     29:                if (ch == 'x') {
                     30:                        ch = getc(inf);
                     31:                        base = 16;
                     32:                } else
                     33:                        base = 8;
                     34:        for (dot = FALSE;; ch = getc(inf)) {
                     35:                if (!isascii(ch))
                     36:                        break;
                     37:                else if (isdigit(ch))
                     38:                        val = ch - '0';
                     39:                else if ('A' <= ch && ch <= 'F')
                     40:                        val = ch + 0xA - 'A';
                     41:                else if ('a' <= ch && ch <= 'f')
                     42:                        val = ch + 0xA - 'a';
                     43:                else if (ch == '.' & !dot) {
                     44:                        dot = TRUE;
                     45:                        continue;
                     46:                } else
                     47:                        break;
                     48:                mitom(val, &dig);
                     49:                smult(&result->mantissa, base, &result->mantissa);
                     50:                madd(&result->mantissa, &dig, &result->mantissa);
                     51:                if (dot)
                     52:                        ++result->scale;
                     53:        }
                     54:        ungetc(ch, inf);
                     55:        mvfree(&dig);
                     56:        return (result);
                     57: }
                     58: 
                     59: 
                     60: /*
                     61:  *     Sibase takes the rvalue pointed to by lval and set ibase
                     62:  *     to it if it is in range (ie. between 2 and 16).
                     63:  */
                     64: 
                     65: sibase(lval)
                     66: rvalue *lval;
                     67: {
                     68:        register int    base;
                     69: 
                     70:        base = rtoint(lval);
                     71:        if (2 > base || base > 16)
                     72:                bcmerr("Invalid input base");
                     73:        ibase = base;
                     74: }

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