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/* Convert DMS string to radians */
#include <projects.h>
#include <string.h>
#include <ctype.h>
static double proj_strtod(char *nptr, char **endptr);
/* following should be sufficient for all but the rediculous */
#define MAX_WORK 64
static const char
*sym = "NnEeSsWw";
static const double
vm[] = {
.0174532925199433,
.0002908882086657216,
.0000048481368110953599
};
double
dmstor(const char *is, char **rs) {
int sign, n, nl;
char *p, *s, work[MAX_WORK];
double v, tv;
if (rs)
*rs = (char *)is;
/* copy sting into work space */
while (isspace(sign = *is)) ++is;
for (n = MAX_WORK, s = work, p = (char *)is; isgraph(*p) && --n ; )
*s++ = *p++;
*s = '\0';
/* it is possible that a really odd input (like lots of leading
zeros) could be truncated in copying into work. But ... */
sign = *(s = work);
if (sign == '+' || sign == '-') s++;
else sign = '+';
for (v = 0., nl = 0 ; nl < 3 ; nl = n + 1 ) {
if (!(isdigit(*s) || *s == '.')) break;
if ((tv = proj_strtod(s, &s)) == HUGE_VAL)
return tv;
switch (*s) {
case 'D': case 'd':
n = 0; break;
case '\'':
n = 1; break;
case '"':
n = 2; break;
case 'r': case 'R':
if (nl) {
pj_errno = -16;
return HUGE_VAL;
}
++s;
v = tv;
goto skip;
default:
v += tv * vm[nl];
skip: n = 4;
continue;
}
if (n < nl) {
pj_errno = -16;
return HUGE_VAL;
}
v += tv * vm[n];
++s;
}
/* postfix sign */
if (*s && (p = strchr(sym, *s))) {
sign = (p - sym) >= 4 ? '-' : '+';
++s;
}
if (sign == '-')
v = -v;
if (rs) /* return point of next char after valid string */
*rs = (char *)is + (s - work);
return v;
}
static double
proj_strtod(char *nptr, char **endptr)
{
char c, *cp = nptr;
double result;
/*
* Scan for characters which cause problems with VC++ strtod()
*/
while ((c = *cp) != '\0') {
if (c == 'd' || c == 'D') {
/*
* Found one, so NUL it out, call strtod(),
* then restore it and return
*/
*cp = '\0';
result = strtod(nptr, endptr);
*cp = c;
return result;
}
++cp;
}
/* no offending characters, just handle normally */
return strtod(nptr, endptr);
}
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