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- /*@H************************ < COMPRESS utility> ****************************
- * $@(#) compusi.uni,v 4.3d 90/01/18 03:00:00 don Release ^ *
- * *
- * compress : compusi.uni <Unix/Xenix support functions> *
- * *
- * port by : Donald J. Gloistein *
- * *
- * Source, Documentation, Object Code: *
- * released to Public Domain. This code is ported from compress v4.0 *
- * release joe. *
- * *
- *--------------------------- Module Description --------------------------*
- * Unix system dependent routines. These are specific to either the *
- * unix file structure or some unix only functions. *
- * *
- * Separated out for ease of writing the main module. *
- * *
- *--------------------------- Implementation Notes --------------------------*
- * *
- * compiled with : compress.h compress.fns *
- * linked with : compress.o compapi.o *
- * *
- * To use, copy or rename this file to compusi.c and recompile. *
- * Set the defines in compress.h to reflect the status of your compiler's *
- * runtime library, allocation type for malloc()'s, and memory models if *
- * applicable, and your library function call for malloc() and free(). *
- * *
- * problems: header has some hardcoded defines you may need to change *
- * for your compiler. Please read the header thoroughly. *
- * *
- *--------------------------- Author(s) -------------------------*
- * Initials ---- Name --------------------------------- *
- * DjG Donald J. Gloistein *
- * Plus many others, see rev.hst file for full list *
- * LvR Lyle V. Rains, thanks for the improved implementation *
- * of the compression and decompression routines. *
- *************************************************************************@H*/
-
- #include <stdio.h>
-
- #include "compress.h" /* contains the rest of the include file declarations */
-
- /* For those who don't have it in libc.a */
-
- #ifdef NO_STRRCHR
- char *strrchr(s,c)
- char *s;
- int c;
- {
- register int count;
-
- while (*s){
- s++;
- count++;
- }
- s--;
- while (count--)
- if (*s == (char)c)
- return(s);
- else
- s--;
- return(NULL);
- }
- #endif
-
- char *get_program_name(ptr)
- char *ptr;
- {
- char *cp;
- if ((cp = strrchr(ptr, '/')) != NULL)
- cp++;
- else
- cp = ptr;
-
- if(strcmp(cp,"uncompress") == 0) {
- do_decomp = 1;
- }
- else
- if(strcmp(cp, "zcat") == 0) {
- keep = TRUE;
- zcat_flg = do_decomp = 1;
- }
- return (cp);
- }
-
-
- char *name_index(ptr)
- char *ptr;
- {
- char *p;
-
- p = strrchr(ptr,'/');
- return ((p)? ++p: ptr);
- }
-
- int is_z_name(ptr) /* checks if it is already a z name */
- char *ptr;
- {
- return (!(strcmp(ptr + strlen(ptr) -2,".Z")));
- }
-
- int make_z_name(ptr)
- char *ptr;
- {
- #ifndef BSD4_2
- if (strlen(name_index(ptr)) > 12 ) {
- fprintf(stderr,"%s: filename too long to add .Z\n",name_index(ptr));
- return FALSE;
- }
- #endif
- strcat(ptr,".Z");
- return TRUE;
- }
- void unmake_z_name(ptr)
- char *ptr;
- {
- register int len = strlen(ptr)-2;
-
- ptr[len] = '\0';
- }
-
- #ifndef NOSIGNAL
- SIGTYPE onintr ( )
- {
- if (!zcat_flg && !keep_error){
- fclose(stdout);
- unlink ( ofname );
- }
- exit ( ERROR );
- }
-
- SIGTYPE oops ( ) /* wild pointer -- assume bad input */
- {
- if ( do_decomp == 1 )
- fprintf ( stderr, "%s: corrupt input: %s\n",prog_name,ifname);
- if (!zcat_flg && !keep_error){
- fclose(stdout);
- unlink ( ofname );
- }
- exit ( ERROR );
- }
- #endif
-
- int test_file(ifname) /* test for a good file name and no links */
- char *ifname; /* returns ERROR for bad file */
- {
- struct stat statbuf;
-
- if (stat(ifname, &statbuf)) { /* Get stat on input file */
- perror(ifname);
- return(ERROR);
- }else if ((statbuf.st_mode & S_IFMT/*0170000*/) != S_IFREG/*0100000*/) {
- fprintf(stderr, "%s -- not a regular file: unchanged",ifname);
- return(ERROR);
- } else if (statbuf.st_nlink > 1) {
- if(quiet)
- fprintf(stderr, "%s -- has %d other links: unchanged",ifname,
- statbuf.st_nlink - 1);
- return(ERROR);
- }
- return (0);
- }
-
- void copystat(ifname, ofname)
- char *ifname, *ofname;
- {
- struct stat statbuf;
- int mode;
- time_t timep[2];
-
- fclose(stdout);
- if (stat(ifname, &statbuf)) { /* Get stat on input file */
- perror(ifname);
- return;
- }
- if (exit_stat == NOSAVING && (!force)) { /* No compression: remove file.Z */
- if(!quiet)
- fprintf(stderr, " -- no savings -- file unchanged");
- }
- else if (exit_stat == NOMEM){
- if (!quiet)
- fprintf(stderr, " -- file unchanged");
- if (!do_decomp)
- exit(ERROR);
- else
- return; /* otherwise will unlink outfile */
- }
- else if (exit_stat == OK) { /* ***** Successful Compression ***** */
- mode = statbuf.st_mode & 07777;
- if (chmod(ofname, mode)) /* Copy modes */
- perror(ofname);
- chown(ofname,statbuf.st_uid,statbuf.st_gid); /* Copy Ownership */
- timep[0] = statbuf.st_atime;
- timep[1] = statbuf.st_mtime;
- utime(ofname,timep); /* Update last accessed and modified times */
- if (!keep){
- fclose(stdin);
- if (unlink(ifname)) /* Remove input file */
- perror(ifname);
- if(!quiet)
- fprintf(stderr, " -- replaced with %s", ofname);
- }
- else{
- if(!quiet)
- fprintf(stderr, " -- compressed to %s", ofname);
- }
- return; /* Successful return */
- }
-
- /* Unsuccessful return -- one of the tests failed */
- fclose(stdout);
- if (unlink(ofname))
- perror(ofname);
- }
-
- #ifndef COMPVER
- #ifdef XENIX
- #define COMPVER "Xenix"
- #else
- #define COMPVER "unix"
- #endif
- #endif
-
- #ifdef COMP40
- #define RESET "Adaptive Reset"
- #else
- #define RESET "No Adaptive Reset"
- #endif
-
- void version()
- {
- #ifdef DEBUG
- fprintf(stderr, "%s\nOptions: %s %s DEBUG MAXBITS = %d\n",rcs_ident,COMPVER,
- RESET,MAXBITS);
- #else
- fprintf(stderr, "%s\nOptions: %s %s MAXBITS = %d\n",rcs_ident,COMPVER,
- RESET,MAXBITS);
- #endif
- }
-
- ALLOCTYPE FAR *emalloc(x,y)
- unsigned int x;
- int y;
- {
- ALLOCTYPE FAR *p;
- p = (ALLOCTYPE FAR *)ALLOCATE(x,y);
- return(p);
- }
-
- void efree(ptr)
- ALLOCTYPE FAR *ptr;
- {
- FREEIT(ptr);
- }
-