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/* Fitsy FITS card parsing routines.
DESCRIPTION
These routines parse FITS cards. Usually the header value routines will
be used instead of these.
EXAMPLES
+
FITSHead fits;
FITSCard card;
FITSType type;
char value[FT_CARDLEN];
int index;
char comment[FT_CARDLEN];
int im; /-* Is this a primary image? *-/
#ft_cardpar(card, &type, value, &index, comm);
card = #ft_headfind(fits, "SIMPLE", 0, 0);
im = #ft_cardgetl(card);
*/
#include "fitsy.h"
/* Parse a FITS card in to its type, value index and comment parts
The ft_cardpar will parse an 80 character fits card in memory
into its parts according to the standard. Some non-standard
card formats are recognized.
Returns
The value parameter.
*/
char *ft_cardpar(card, type, value, index, comm)
FITSCard card; /* FITS card to parse. */
FITSType *type; /* Returned card type. */
char *value; /* Returned card value string. */
int *index; /* Returned index of the card keyword. */
char *comm; /* Returned card comment. */
{
int i=0, j;
if ( card == NULL ) {
*value = '\0';
return value;
}
if ( index ) *index = strtol(&card->c[5], NULL, 0);
value[0] = '\0';
if ( !strncmp(card->c, "HISTORY ", 8) || !strncmp(card->c, "COMMENT ", 8)
|| !strncmp(card->c, "CONTINUE ", 9)
|| !strncmp(card->c, " ", 8) || (*card).c[8] != '=' ) {
strncpy(value, &(*card).c[8], sizeof(FITSBuff) - 8);
if ( type != NULL ) *type = FT_COMMENT;
} else {
if ( card->c[10] == '\'' ) {
if ( type != NULL ) *type = FT_STRING;
for ( i = 11, j = 0; i < FT_CARDLEN; i++, j++ ) {
if ( card->c[i] == '\'' ) {
if ( i+1 == FT_CARDLEN || card->c[i+1] != '\'' ) {
break;
} else {
i++;
}
}
value[j] = card->c[i];
}
for ( ; j && value[j-1] == ' '; j-- );
value[j] = '\0';
} else {
if ( type != NULL ) *type = FT_INTEGER;
for ( i = 10; i < FT_CARDLEN; i++ )
if ( card->c[i] != ' ' )
break;
if ( ( card->c[i] == 'T' || card->c[i] == 'F'
|| card->c[i] == 't' || card->c[i] == 'f' )
&& type != NULL ) *type = FT_LOGICAL;
for ( j = 0; i < FT_CARDLEN; i++, j++ ) {
if ( card->c[i] == '/' ) break;
if ( card->c[i] == '.' && type != NULL ) *type = FT_REAL;
value[j] = (*card).c[i];
}
value[j] = '\0';
}
}
if ( comm != NULL ) {
for ( ; i < FT_CARDLEN && card->c[i] != '/' ; i++ );
i++;
for ( j = 0; i < FT_CARDLEN; i++, j++ )
comm[j] = card->c[i];
comm[j] = '\0';
}
return value;
}
static FITSBuff ft_value;
/* Return the value of a FITS card in a static buffer.
*/
char *ft_cardget(card)
FITSCard card;
{
return ft_cardpar(card, NULL, (char *) ft_value.c, NULL, NULL);
}
/* Return the value of a FITS card as a logical.
*/
int ft_cardgetl(card)
FITSCard card;
{
char *value = ft_cardget(card);
return *value == 'T' || *value == 't';
}
/* Return the value of a FITS card as an integer.
*/
int ft_cardgeti(card)
FITSCard card;
{
/* return strtol(ft_cardget(card), NULL, 0); */
return (int)ft_cardgetr(card);
}
/* Return the value of a FITS card as an integer.
*/
longlong ft_cardgetil(card)
FITSCard card;
{
/* return strtol(ft_cardget(card), NULL, 0); */
return (longlong)ft_cardgetr(card);
}
/* Return the value of a FITS card as a double.
*/
double ft_cardgetr(card)
FITSCard card;
{
int i;
char *s = ft_cardget(card);
/* change final 'D' to 'E' so that strtod() can convert correctly */
for(i=strlen(s)-1; i>=0; i--){
if( s[i] == 'D' ){
s[i] = 'E';
break;
}
}
return strtod(s, NULL);
}
/* Return the value of a FITS card as an allocated string.
The returned string is allocated with strdup().
*/
char *ft_cardgets(card)
FITSCard card;
{
return (char *)strdup(ft_cardget(card));
}
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