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greg |
2.4 |
/* Copyright (c) 1992 Regents of the University of California */ |
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greg |
1.1 |
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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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greg |
2.4 |
#include "paths.h" |
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greg |
1.1 |
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greg |
1.2 |
char *libpath = NULL; /* library search path */ |
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greg |
1.1 |
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greg |
1.2 |
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greg |
1.1 |
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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greg |
2.5 |
extern char *strcpy(), *getenv(); |
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greg |
1.1 |
FILE *fp; |
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greg |
2.5 |
char pname[MAXPATH]; |
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greg |
1.1 |
register char *sp, *cp; |
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if (fname == NULL) |
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return(NULL); |
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greg |
2.5 |
if (ISDIRSEP(fname[0]) || fname[0] == '.') /* absolute path */ |
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greg |
1.1 |
return(fopen(fname, "r")); |
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greg |
1.2 |
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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greg |
1.1 |
} |
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/* check search path */ |
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greg |
1.2 |
sp = libpath; |
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greg |
1.1 |
do { |
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cp = pname; |
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greg |
2.3 |
while (*sp && (*cp = *sp++) != PATHSEP) |
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cp++; |
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greg |
2.5 |
if (cp > pname && !ISDIRSEP(cp[-1])) |
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greg |
2.3 |
*cp++ = DIRSEP; |
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greg |
1.1 |
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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} |
