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/* |
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* header.c - routines for reading and writing information headers. |
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* |
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* Externals declared in resolu.h |
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* Externals declared in rtio.h |
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* |
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* newheader(t,fp) start new information header identified by string t |
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* headidval(r,s) copy header identifier value in s to r |
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* printargs(ac,av,fp) print an argument list to fp, followed by '\n' |
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* formatval(r,s) copy the format value in s to r |
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* fputformat(s,fp) write "FORMAT=%s" to fp |
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* nativebigendian() are we native on big-endian machine? |
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* isbigendian(s) header line matches "BigEndian=1" (-1 if irrelevant) |
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* fputendian(fp) write native endianness in BigEndian= line |
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* getheader(fp,f,p) read header from fp, calling f(s,p) on each line |
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* globmatch(pat, str) check for glob match of str against pat |
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* checkheader(i,p,o) check header format from i against p and copy to o |
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#include <ctype.h> |
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#include "tiff.h" /* for int32 */ |
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#include "rtio.h" |
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#include "resolu.h" |
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|
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const char TMSTR[] = "CAPDATE="; /* capture date identifier */ |
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const char GMTSTR[] = "GMT="; /* GMT identifier */ |
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|
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const char BIGEND[] = "BigEndian="; /* big-endian variable */ |
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|
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static gethfunc mycheck; |
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int |
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nativebigendian() /* are we native on a big-endian machine? */ |
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{ |
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union { int32 i; char c[4]; } u; |
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|
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u.i = 1; |
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|
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return(u.c[0] == 0); |
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} |
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|
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|
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int |
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isbigendian( /* header line says "BigEndian=1" (-1 if irrelevant) */ |
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const char *s |
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) |
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{ |
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const char *be = BIGEND; |
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|
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while ((*s != '\0') & (*be != '=') && *s++ == *be) |
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++be; |
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if (*be != '=') |
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return(-1); /* irrelevant */ |
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while (isspace(*s)) |
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s++; |
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if (*s++ != '=') |
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return(-1); |
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while (isspace(*s)) |
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s++; |
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return(*s == '1'); |
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} |
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|
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|
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void |
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fputendian( /* write native endianness in BigEndian= line */ |
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FILE *fp |
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) |
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{ |
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fputs(BIGEND, fp); |
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if (nativebigendian()) |
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fputs("1\n", fp); |
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else |
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fputs("0\n", fp); |
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} |
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|
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|
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int |
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getheader( /* get header from file */ |
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FILE *fp, |
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gethfunc *f, |
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{ |
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int rtotal = 0; |
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char buf[MAXLINE]; |
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int firstc = fgetc(fp); |
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|
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if (!isprint(firstc)) |
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return(-1); /* messed up */ |
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ungetc(firstc, fp); |
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for ( ; ; ) { |
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int rval = 0; |
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buf[MAXLINE-2] = '\n'; |
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if (fgets(buf, MAXLINE, fp) == NULL) |
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return(-1); |
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if (buf[buf[0]=='\r'] == '\n') |
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if (buf[buf[0]=='\r'] == '\n') /* end of header? */ |
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return(rtotal); |
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if (buf[MAXLINE-2] != '\n') { |
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ungetc(buf[MAXLINE-2], fp); /* prevent false end */ |
