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- /* $Header: util.c,v 4.3.3.3 91/01/16 03:41:50 davison Trn $
- *
- * $Log: util.c,v $
- * Revision 4.3.3.3 91/01/16 03:41:50 davison
- * Integrated rn patches 48-54.
- *
- * Revision 4.3.3.2 90/08/20 16:51:44 davison
- * Fixed getcwd call to not overflow any buffers.
- *
- * Revision 4.3.3.1 90/07/21 20:34:10 davison
- * Initial Trn Release
- *
- * Revision 4.3.2.8 90/11/22 13:54:06 sob
- * Made changes to keep more preprocessors happy.
- *
- * Revision 4.3.2.7 90/10/01 01:52:18 sob
- * Altered the preprocessor defines on GETWD/GETCWD per suggestion by
- * rsm@math.arizona.edu.
- *
- * Revision 4.3.2.6 90/04/23 00:24:42 sob
- * A bit of clean up.
- *
- * Revision 4.3.2.5 90/03/17 21:34:21 sob
- * Reworked VOIDSIG into SIGRET.
- *
- * Revision 4.3.2.4 89/12/14 23:58:54 sob
- * Fixed small bug reported by fletcher@cs.utexas.edu in getwd().
- *
- * Revision 4.3.2.3 89/11/08 04:47:11 sob
- * Added VOIDSIG handling for SunOS 4.X
- *
- * Revision 4.3.2.2 89/11/07 23:19:35 sob
- * Bug fixes for SIGSTP problems
- *
- * Revision 4.3.2.1 89/11/06 01:03:21 sob
- * Added RRN support from NNTP 1.5
- *
- * Revision 4.3.1.2 85/05/15 14:44:27 lwall
- * Last arg of execl changed from 0 to Nullch [(char*)0].
- *
- * Revision 4.3.1.1 85/05/10 11:41:30 lwall
- * Branch for patches.
- *
- * Revision 4.3 85/05/01 11:51:44 lwall
- * Baseline for release with 4.3bsd.
- *
- */
-
- #include "EXTERN.h"
- #include "common.h"
- #include "final.h"
- #include "ndir.h"
- #include "INTERN.h"
- #include "util.h"
-
- void
- util_init()
- {
- ;
- }
-
- /* fork and exec a shell command */
-
- int
- doshell(shl,s)
- char *s, *shl;
- {
- int status, pid, w;
- char *shell;
-
- #ifdef SIGTSTP
- sigset(SIGTSTP,SIG_DFL);
- sigset(SIGTTOU,SIG_DFL);
- sigset(SIGTTIN,SIG_DFL);
- #endif
- if (shl != Nullch)
- shell = shl;
- else if ((shell = getenv("SHELL")) == Nullch || !*shell)
- shell = PREFSHELL;
- if ((pid = vfork()) == 0) {
- #ifdef SERVER
- int i;
-
- /* This is necessary to keep bourne shell from puking */
-
- for (i = 3; i < 10; ++i)
- close(i);
- #endif /* SERVER */
-
- if (*s)
- execl(shell, shell, "-c", s, Nullch);
- else
- execl(shell, shell, Nullch, Nullch, Nullch);
- _exit(127);
- }
- signal(SIGINT, SIG_IGN);
- #ifdef SIGQUIT
- signal(SIGQUIT, SIG_IGN);
- #endif
- waiting = TRUE;
- while ((w = wait(&status)) != pid && w != -1)
- ;
- if (w == -1)
- status = -1;
- waiting = FALSE;
- sigset(SIGINT, int_catcher); /* always catch interrupts */
- #ifdef SIGQUIT
- signal(SIGQUIT, SIG_DFL);
- #endif
- #ifdef SIGTSTP
- sigset(SIGTSTP,stop_catcher);
- sigset(SIGTTOU,stop_catcher);
- sigset(SIGTTIN,stop_catcher);
- #endif
- return status;
- }
-
- static char nomem[] = "rn: out of memory!\n";
-
- /* paranoid version of malloc */
-
- char *
- safemalloc(size)
- MEM_SIZE size;
- {
- char *ptr;
- char *malloc();
-
- ptr = malloc(size ? size : (MEM_SIZE)1);
- if (ptr != Nullch)
- return ptr;
- else {
- fputs(nomem,stdout) FLUSH;
- sig_catcher(0);
- }
- /*NOTREACHED*/
- }
-
- /* paranoid version of realloc */
-
- char *
- saferealloc(where,size)
- char *where;
- MEM_SIZE size;
- {
- char *ptr;
- char *realloc();
-
- ptr = realloc(where,size?size:1); /* realloc(0) is NASTY on our system */
- if (ptr != Nullch)
- return ptr;
- else {
- fputs(nomem,stdout) FLUSH;
- sig_catcher(0);
- }
- /*NOTREACHED*/
- }
-
- /* safe version of string copy */
-
- char *
- safecpy(to,from,len)
- char *to;
- register char *from;
- register int len;
- {
- register char *dest = to;
-
- if (from != Nullch)
- for (len--; len && (*dest++ = *from++); len--) ;
- *dest = '\0';
- return to;
- }
-
- /* safe version of string concatenate, with \n deletion and space padding */
-
- char *
- safecat(to,from,len)
- char *to;
- register char *from;
- register int len;
- {
- register char *dest = to;
-
- len--; /* leave room for null */
- if (*dest) {
- while (len && *dest++) len--;
- if (len) {
- len--;
- *(dest-1) = ' ';
- }
- }
- if (from != Nullch)
- while (len && (*dest++ = *from++)) len--;
- if (len)
- dest--;
- if (*(dest-1) == '\n')
- dest--;
- *dest = '\0';
- return to;
- }
-
- /* copy a string up to some (non-backslashed) delimiter, if any */
-
- char *
- cpytill(to,from,delim)
- register char *to, *from;
- register int delim;
- {
- for (; *from; from++,to++) {
- if (*from == '\\' && from[1] == delim)
- from++;
- else if (*from == delim)
- break;
- *to = *from;
- }
- *to = '\0';
- return from;
- }
-
- /* return ptr to little string in big string, NULL if not found */
-
- char *
- instr(big, little)
- char *big, *little;
-
- {
- register char *t, *s, *x;
-
- for (t = big; *t; t++) {
- for (x=t,s=little; *s; x++,s++) {
- if (!*x)
- return Nullch;
- if (*s != *x)
- break;
- }
- if (!*s)
- return t;
- }
- return Nullch;
- }
-
- /* effective access */
-
- #ifdef SETUIDGID
- int
- eaccess(filename, mod)
- char *filename;
- int mod;
- {
- int protection, euid;
-
- mod &= 7; /* remove extraneous garbage */
- if (stat(filename, &filestat) < 0)
- return -1;
- euid = geteuid();
- if (euid == ROOTID)
- return 0;
- protection = 7 & (filestat.st_mode >>
- (filestat.st_uid == euid ? 6 :
- (filestat.st_gid == getegid() ? 3 : 0)
- ));
- if ((mod & protection) == mod)
- return 0;
- errno = EACCES;
- return -1;
- }
- #endif
-
- /*
- * Get working directory
- */
- #ifndef GETWD
- #ifdef GETCWD
- char *
- getwd(np)
- char *np;
- {
- char * name;
- extern char * getcwd();
- name = getcwd(np,512);
- return(name);
- }
- #else
- char *
- getwd(np) /* shorter but slower */
- char *np;
- {
- FILE *popen();
- FILE *pipefp = popen("/bin/pwd","r");
-
- if (pipefp == Nullfp) {
- printf("Can't run /bin/pwd\n") FLUSH;
- finalize(1);
- }
- fgets(np,512,pipefp);
- np[strlen(np)-1] = '\0'; /* wipe out newline */
- pclose(pipefp);
- return np;
- }
- #endif
- #endif
- /* just like fgets but will make bigger buffer as necessary */
-
- char *
- get_a_line(original_buffer,buffer_length,fp)
- char *original_buffer;
- register int buffer_length;
- FILE *fp;
- {
- register int bufix = 0;
- register int nextch;
- register char *some_buffer_or_other = original_buffer;
-
- do {
- if (bufix >= buffer_length) {
- buffer_length *= 2;
- if (some_buffer_or_other == original_buffer) {
- /* currently static? */
- some_buffer_or_other = safemalloc((MEM_SIZE)buffer_length+1);
- strncpy(some_buffer_or_other,original_buffer,buffer_length/2);
- /* so we must copy it */
- }
- else { /* just grow in place, if possible */
- some_buffer_or_other = saferealloc(some_buffer_or_other,
- (MEM_SIZE)buffer_length+1);
- }
- }
- if ((nextch = getc(fp)) == EOF)
- return Nullch;
- some_buffer_or_other[bufix++] = (char) nextch;
- } while (nextch && nextch != '\n');
- some_buffer_or_other[bufix] = '\0';
- len_last_line_got = bufix;
- return some_buffer_or_other;
- }
-
- /* copy a string to a safe spot */
-
- char *
- savestr(str)
- char *str;
- {
- register char *newaddr = safemalloc((MEM_SIZE)(strlen(str)+1));
-
- strcpy(newaddr,str);
- return newaddr;
- }
-
- int
- makedir(dirname,nametype)
- register char *dirname;
- int nametype;
- {
- #ifdef MAKEDIR
- register char *end;
- register char *s;
- char tmpbuf[1024];
- register char *tbptr = tmpbuf+5;
-
- for (end = dirname; *end; end++) ; /* find the end */
- if (nametype == MD_FILE) { /* not to create last component? */
- for (--end; end != dirname && *end != '/'; --end) ;
- if (*end != '/')
- return 0; /* nothing to make */
- *end = '\0'; /* isolate file name */
- }
- strcpy(tmpbuf,"mkdir");
-
- s = end;
- for (;;) {
- if (stat(dirname,&filestat) >= 0 && (filestat.st_mode & S_IFDIR)) {
- /* does this much exist as a dir? */
- *s = '/'; /* mark this as existing */
- break;
- }
- s = rindex(dirname,'/'); /* shorten name */
- if (!s) /* relative path! */
- break; /* hope they know what they are doing */
- *s = '\0'; /* mark as not existing */
- }
-
- for (s=dirname; s <= end; s++) { /* this is grody but efficient */
- if (!*s) { /* something to make? */
- sprintf(tbptr," %s",dirname);
- tbptr += strlen(tbptr); /* make it, sort of */
- *s = '/'; /* mark it made */
- }
- }
- if (nametype == MD_DIR) /* don't need final slash unless */
- *end = '\0'; /* a filename follows the dir name */
-
- return (tbptr==tmpbuf+5 ? 0 : doshell(sh,tmpbuf));
- /* exercise our faith */
- #else
- sprintf(cmd_buf,"%s %s %d", filexp(DIRMAKER), dirname, nametype);
- return doshell(sh,cmd_buf);
- #endif
- }
-
- #ifdef SETENV
- static bool firstsetenv = TRUE;
- extern char **environ;
-
- void
- setenv(nam,val)
- char *nam, *val;
- {
- register int i=envix(nam); /* where does it go? */
-
- if (!environ[i]) { /* does not exist yet */
- if (firstsetenv) { /* need we copy environment? */
- int j;
- #ifndef lint
- char **tmpenv = (char**) /* point our wand at memory */
- safemalloc((MEM_SIZE) (i+2) * sizeof(char*));
- #else
- char **tmpenv = Null(char **);
- #endif /* lint */
-
- firstsetenv = FALSE;
- for (j=0; j<i; j++) /* copy environment */
- tmpenv[j] = environ[j];
- environ = tmpenv; /* tell exec where it is now */
- }
- #ifndef lint
- else
- environ = (char**) saferealloc((char*) environ,
- (MEM_SIZE) (i+2) * sizeof(char*));
- /* just expand it a bit */
- #endif /* lint */
- environ[i+1] = Nullch; /* make sure it's null terminated */
- }
- environ[i] = safemalloc((MEM_SIZE) strlen(nam) + strlen(val) + 2);
- /* this may or may not be in */
- /* the old environ structure */
- sprintf(environ[i],"%s=%s",nam,val);/* all that work just for this */
- }
-
- int
- envix(nam)
- char *nam;
- {
- register int i, len = strlen(nam);
-
- for (i = 0; environ[i]; i++) {
- if (strnEQ(environ[i],nam,len) && environ[i][len] == '=')
- break; /* strnEQ must come first to avoid */
- } /* potential SEGV's */
- return i;
- }
- #endif
-
- void
- notincl(feature)
- char *feature;
- {
- printf("\nNo room for feature \"%s\" on this machine.\n",feature) FLUSH;
- }
-
- char *
- getval(nam,def)
- char *nam,*def;
- {
- char *val;
-
- if ((val = getenv(nam)) == Nullch || !*val)
- val = def;
- return val;
- }
-
- /* grow a static string to at least a certain length */
-
- void
- growstr(strptr,curlen,newlen)
- char **strptr;
- int *curlen;
- int newlen;
- {
- if (newlen > *curlen) { /* need more room? */
- if (*curlen)
- *strptr = saferealloc(*strptr,(MEM_SIZE)newlen);
- else
- *strptr = safemalloc((MEM_SIZE)newlen);
- *curlen = newlen;
- }
- }
-
- void
- setdef(buffer,dflt)
- char *buffer,*dflt;
- {
- #ifdef STRICTCR
- if (*buffer == ' ')
- #else
- if (*buffer == ' ' || *buffer == '\n')
- #endif
- {
- if (*dflt == '^' && isupper(dflt[1]))
- *buffer = Ctl(dflt[1]);
- else
- *buffer = *dflt;
- }
- }
-