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/* Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
*/
#include <ctype.h>
#define import_spp
#define import_libc
#define import_lexnum
#define import_xnames
#include <iraf.h>
/* LEXNUM -- Lexically analyze a string to determine if it is a legal IRAF
** style number. Returns one of the following tokens (lexnum.h):
**
** LEX_OCTAL octal number (e.g. B suffix)
** LEX_HEX hex number (e.g. X suffix)
** LEX_DECIMAL decimal number
** LEX_REAL real number (incl sexagesimal)
** LEX_NONNUM nonnumeric
**
** A numeric token is returned if any (prefix) portion of the field is
** numeric. The total number of numeric characters is also returned so
** that the application may verify that the entire field was numeric,
** if desired.
*/
int
c_lexnum (
char *str, /* input string */
int *toklen /* nchars in token */
)
{
register char *ip;
register XCHAR *op, ch, ndigits;
XCHAR numbuf[SZ_FNAME];
XINT ip_start = 1, x_toklen = *toklen;
int status;
/* Convert number to XCHAR for lexnum. In the process check to see
* if we have a simple decimal integer constant to save a scan.
*/
for (ip=str, op=numbuf, ndigits=0; (*op++ = ch = *ip++); )
if (isdigit (ch))
ndigits++;
if (ndigits == (ip - str - 1)) {
*toklen = ndigits;
return (LEX_DECIMAL);
} else {
status = LEXNUM (numbuf, &ip_start, &x_toklen);
*toklen = (int) x_toklen;
return (status);
}
}
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