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/* Copyright (c) 1990 Regents of the University of California */
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#ifndef lint
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static char SCCSid[] = "$SunId$ LBL";
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#endif
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/*
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* Find and open a Radiance library file.
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*/
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#include <stdio.h>
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#ifndef DEFPATH
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#define DEFPATH ":/usr/local/lib/ray"
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#endif
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#ifndef ULIBVAR
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#define ULIBVAR "RAYPATH"
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#endif
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#ifndef DIRSEP
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#define DIRSEP '/'
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#endif
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#ifndef PATHSEP
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#define PATHSEP ':'
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#endif
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char *libpath = NULL; /* library search path */
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FILE *
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fropen(fname) /* find file and open for reading */
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register char *fname;
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{
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extern char *strcpy(), *getenv();
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FILE *fp;
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char pname[256];
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register char *sp, *cp;
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if (fname == NULL)
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return(NULL);
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if (fname[0] == DIRSEP || fname[0] == '.') /* absolute path */
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return(fopen(fname, "r"));
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if (libpath == NULL) { /* get search path */
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libpath = getenv(ULIBVAR);
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if (libpath == NULL)
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libpath = DEFPATH;
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}
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/* check search path */
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sp = libpath;
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do {
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cp = pname;
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while (*sp && (*cp = *sp++) != PATHSEP)
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cp++;
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if (cp > pname && cp[-1] != DIRSEP)
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*cp++ = DIRSEP;
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strcpy(cp, fname);
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if ((fp = fopen(pname, "r")) != NULL)
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return(fp); /* got it! */
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} while (*sp);
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/* not found */
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return(NULL);
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}
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