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greg |
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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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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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static char *searchpath; |
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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] == '/' || fname[0] == '.') /* absolute path */ |
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return(fopen(fname, "r")); |
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if (searchpath == NULL) { /* get search path */ |
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searchpath = getenv(ULIBVAR); |
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if (searchpath == NULL) |
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searchpath = DEFPATH; |
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} |
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/* check search path */ |
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sp = searchpath; |
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do { |
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cp = pname; |
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while (*sp && (*cp = *sp++) != ':') |
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cp++; |
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if (cp > pname && cp[-1] != '/') |
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*cp++ = '/'; |
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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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} |
