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#ifndef lint |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* getpath.c - function to search for file in a list of directories |
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* |
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* External symbols declared in standard.h |
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*/ |
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|
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#include "copyright.h" |
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|
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#include "standard.h" |
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|
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#include "paths.h" |
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|
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#ifndef NIX |
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#include <pwd.h> |
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extern struct passwd *getpwnam(); |
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#endif |
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|
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|
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char * |
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getpath(fname, searchpath, mode) /* expand fname, return full path */ |
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register char *fname; |
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register char *searchpath; |
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int mode; |
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{ |
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#ifndef NIX |
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struct passwd *pwent; |
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#endif |
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static char pname[MAXPATH]; |
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register char *cp; |
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|
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if (fname == NULL) |
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return(NULL); |
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|
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pname[0] = '\0'; /* check for full specification */ |
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switch (*fname) { |
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CASEDIRSEP: /* relative to root */ |
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case '.': /* relative to cwd */ |
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strcpy(pname, fname); |
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break; |
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#ifndef NIX |
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case '~': /* relative to home directory */ |
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fname++; |
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if (*fname == '\0' || ISDIRSEP(*fname)) { /* ours */ |
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if ((cp = getenv("HOME")) == NULL) |
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return(NULL); |
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strcpy(pname, cp); |
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strcat(pname, fname); |
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break; |
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} |
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cp = pname; /* user */ |
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do |
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*cp++ = *fname++; |
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while (*fname && !ISDIRSEP(*fname)); |
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*cp = '\0'; |
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if ((pwent = getpwnam(pname)) == NULL) |
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return(NULL); |
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strcpy(pname, pwent->pw_dir); |
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strcat(pname, fname); |
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break; |
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#endif |
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} |
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if (pname[0]) /* got it, check access if search requested */ |
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return(searchpath==NULL||access(pname,mode)==0 ? pname : NULL); |
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|
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if (searchpath == NULL) { /* don't search */ |
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strcpy(pname, fname); |
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return(pname); |
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} |
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/* check search path */ |
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do { |
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cp = pname; |
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while (*searchpath && (*cp = *searchpath++) != PATHSEP) |
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cp++; |
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if (cp > pname && !ISDIRSEP(cp[-1])) |
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*cp++ = DIRSEP; |
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strcpy(cp, fname); |
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if (access(pname, mode) == 0) /* file accessable? */ |
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return(pname); |
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} while (*searchpath); |
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/* not found */ |
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return(NULL); |
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} |
