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/*
** libproj -- library of cartographic projections
**
** Copyright (c) 2003, 2006 Gerald I. Evenden
*/
static const char
LIBPROJ_ID[] = "Id";
/*
** Permission is hereby granted, free of charge, to any person obtaining
** a copy of this software and associated documentation files (the
** "Software"), to deal in the Software without restriction, including
** without limitation the rights to use, copy, modify, merge, publish,
** distribute, sublicense, and/or sell copies of the Software, and to
** permit persons to whom the Software is furnished to do so, subject to
** the following conditions:
**
** The above copyright notice and this permission notice shall be
** included in all copies or substantial portions of the Software.
**
** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
** IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
** CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
** SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/*
** Convert DMS string to radians
*/
#include <lib_proj.h>
#include <string.h>
#include <ctype.h>
/* 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
proj_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 = 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) {
proj_errno = -16;
return HUGE_VAL;
}
++s;
v = tv;
goto skip;
default:
v += tv * vm[nl];
skip: n = 4;
continue;
}
if (n < nl) {
proj_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;
}
/*
** Log: proj_dmstor.c
** Revision 3.1 2006/01/11 01:38:18 gie
** Initial
**
*/
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