mirror of https://github.com/rfivet/uemacs.git
147 lines
2.6 KiB
C
147 lines
2.6 KiB
C
/* flook.c -- implements flook.h */
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#include "flook.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "estruct.h"
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#include "fileio.h"
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/* possible names and paths of help files under different OSs */
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const char *pathname[] = {
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#if MSDOS
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"emacs.rc",
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"emacs.hlp",
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"\\sys\\public\\",
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"\\usr\\bin\\",
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"\\bin\\",
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"\\",
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""
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#endif
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#if V7 | BSD | USG
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".emacsrc",
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"emacs.hlp",
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#if PKCODE
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"/usr/global/lib/", "/usr/local/bin/", "/usr/local/lib/",
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#endif
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"/usr/local/", "/usr/lib/", ""
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#endif
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#if VMS
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{
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"emacs.rc", "emacs.hlp", "",
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#if PKCODE
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"sys$login:", "emacs_dir:",
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#endif
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"sys$sysdevice:[vmstools]"
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#endif
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};
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#define PATHNAME_SIZE (sizeof pathname / sizeof pathname[ 0])
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/*
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* does <fname> exist on disk?
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*
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* char *fname; file to check for existance
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*/
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boolean fexist( const char *fname)
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{
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FILE *fp;
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/* try to open the file for reading */
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fp = fopen(fname, "r");
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/* if it fails, just return false! */
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if (fp == NULL)
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return FALSE;
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/* otherwise, close it and report true */
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fclose(fp);
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return TRUE;
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}
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/*
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* Look up the existance of a file along the normal or PATH
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* environment variable. Look first in the HOME directory if
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* asked and possible
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*
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* char *fname; base file name to search for
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* boolean hflag; Look in the HOME environment variable first?
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*/
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char *flook( const char *fname, boolean hflag)
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{
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int i; /* index */
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static char fspec[NSTRING]; /* full path spec to search */
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#if ENVFUNC
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char *path; /* environmental PATH variable */
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if (hflag) {
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char *home; /* path to home directory */
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home = getenv("HOME");
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if (home != NULL) {
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/* build home dir file spec */
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strcpy(fspec, home);
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strcat(fspec, "/");
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strcat(fspec, fname);
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/* and try it out */
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if( fexist( fspec))
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return fspec ;
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}
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}
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#endif
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/* always try the current directory first */
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strcpy( fspec, fname) ;
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if( fexist( fspec))
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return fspec ;
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#if ENVFUNC
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/* get the PATH variable */
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path = getenv("PATH");
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if (path != NULL)
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while (*path) {
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char *sp; /* pointer into path spec */
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/* build next possible file spec */
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sp = fspec;
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while (*path && (*path != PATHCHR))
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*sp++ = *path++;
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/* add a terminating dir separator if we need it */
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if (sp != fspec)
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*sp++ = '/';
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*sp = 0;
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strcat(fspec, fname);
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/* and try it out */
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if( fexist( fspec))
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return fspec ;
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if (*path == PATHCHR)
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++path;
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}
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#endif
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/* look it up via the old table method */
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for( i = 2; i < PATHNAME_SIZE ; i++) {
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strcpy(fspec, pathname[i]);
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strcat(fspec, fname);
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/* and try it out */
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if( fexist( fspec))
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return fspec ;
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}
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return NULL; /* no such luck */
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}
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