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Annotation of 42BSD/ingres/source/libq/IIatoi.c, revision 1.1

1.1     ! root        1: # include      <sccs.h>
        !             2: 
        !             3: SCCSID(@(#)IIatoi.c    7.1     2/5/81)
        !             4: 
        !             5: 
        !             6: /*
        !             7: **  IIatoi()
        !             8: **  ASCII CHARACTER STRING TO 16-BIT INTEGER CONVERSION
        !             9: **
        !            10: **     `a' is a pointer to the character string, `i' is a
        !            11: **     pointer to the word which is to contain the result.
        !            12: **
        !            13: **     The return value of the function is:
        !            14: **             zero:   succesful conversion; `i' contains the integer
        !            15: **             +1:     numeric overflow; `i' is unchanged
        !            16: **             -1:     syntax error; `i' is unchanged
        !            17: **
        !            18: **     A valid string is of the form:
        !            19: **             <space>* [+-] <space>* <digit>* <space>*
        !            20: **
        !            21: **             Eric's utility routine.
        !            22: **
        !            23: */
        !            24: 
        !            25: IIatoi(a1, i)
        !            26: char   *a1;
        !            27: int    *i;
        !            28: {
        !            29:        int             sign;           /* flag to indicate the sign */
        !            30:        register int    x;              /* holds the integer being formed */
        !            31:        register char   c;
        !            32:        register char   *a;
        !            33: 
        !            34:        a = a1;
        !            35:        sign = 0;
        !            36:        /* skip leading blanks */
        !            37:        while (*a == ' ')
        !            38:                a++;
        !            39:        /* check for sign */
        !            40:        switch (*a)
        !            41:        {
        !            42: 
        !            43:          case '-':
        !            44:                sign = -1;
        !            45: 
        !            46:          case '+':
        !            47:                while (*++a == ' ');
        !            48:        }
        !            49: 
        !            50:        /* at this point everything had better be numeric */
        !            51:        x = 0;
        !            52:        while ((c = *a) <= '9' && c >= '0')
        !            53:        {
        !            54:                if (x > 3276 || (x == 3276 && c > '7'))
        !            55:                        return (1);             /* overflow */
        !            56:                x = x * 10 + c - '0';
        !            57:                a++;
        !            58:        }
        !            59: 
        !            60:        /* eaten all the numerics; better be all blanks */
        !            61:        while (c = *a++)
        !            62:                if(c != ' ')                    /* syntax error */
        !            63:                        return (-1);
        !            64:        *i = sign ? -x : x;
        !            65:        return (0);             /* successful termination */
        !            66: }

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