svn-gvsig-desktop / tags / gvsig_redes-1_0_0-1234 / libraries / libjni-proj4 / src / dmstor.c @ 33816
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/* Convert DMS string to radians */
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#ifndef lint
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static const char SCCSID[]="@(#)dmstor.c 4.4 93/06/16 GIE REL"; |
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#endif
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#include <projects.h> |
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#include <string.h> |
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#include <ctype.h> |
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static double proj_strtod(char *nptr, char **endptr); |
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/* following should be sufficient for all but the rediculous */
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#define MAX_WORK 64 |
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static const char |
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*sym = "NnEeSsWw";
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static const double |
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vm[] = { |
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.0174532925199433,
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.0002908882086657216,
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.0000048481368110953599
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}; |
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double
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dmstor(const char *is, char **rs) { |
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int sign, n, nl;
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char *p, *s, work[MAX_WORK];
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double v, tv;
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if (rs)
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*rs = (char *)is;
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/* copy sting into work space */
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while (isspace(sign = *is)) ++is;
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for (n = MAX_WORK, s = work, p = (char *)is; isgraph(*p) && --n ; ) |
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*s++ = *p++; |
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*s = '\0';
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/* it is possible that a really odd input (like lots of leading
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zeros) could be truncated in copying into work. But ... */
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sign = *(s = work); |
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if (sign == '+' || sign == '-') s++; |
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else sign = '+'; |
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for (v = 0., nl = 0 ; nl < 3 ; nl = n + 1 ) { |
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if (!(isdigit(*s) || *s == '.')) break; |
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if ((tv = proj_strtod(s, &s)) == HUGE_VAL)
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return tv;
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switch (*s) {
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case 'D': case 'd': |
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n = 0; break; |
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case '\'': |
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n = 1; break; |
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case '"': |
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n = 2; break; |
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case 'r': case 'R': |
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if (nl) {
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pj_errno = -16;
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return HUGE_VAL;
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} |
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++s; |
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v = tv; |
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goto skip;
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default:
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v += tv * vm[nl]; |
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skip: n = 4; |
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continue;
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} |
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if (n < nl) {
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pj_errno = -16;
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return HUGE_VAL;
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} |
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v += tv * vm[n]; |
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++s; |
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} |
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/* postfix sign */
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if (*s && (p = strchr(sym, *s))) {
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sign = (p - sym) >= 4 ? '-' : '+'; |
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++s; |
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} |
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if (sign == '-') |
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v = -v; |
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if (rs) /* return point of next char after valid string */ |
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*rs = (char *)is + (s - work);
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return v;
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} |
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static double |
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proj_strtod(char *nptr, char **endptr) |
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{ |
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char c, *cp = nptr;
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double result;
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/*
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* Scan for characters which cause problems with VC++ strtod()
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*/
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while ((c = *cp) != '\0') { |
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if (c == 'd' || c == 'D') { |
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/*
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* Found one, so NUL it out, call strtod(),
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* then restore it and return
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*/
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*cp = '\0';
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result = strtod(nptr, endptr); |
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*cp = c; |
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return result;
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} |
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++cp; |
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} |
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/* no offending characters, just handle normally */
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return strtod(nptr, endptr);
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} |
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