+static char sccsid[] = "@(#)file.c 3.1 %G%";
+/*
+ * file - determine type of file
+ */
+
+#include <pagsiz.h>
+#include <sys/types.h>
+#include <stat.h>
+#include <stdio.h>
+#include <ctype.h>
+#include <newa.out.h>
+int in;
+int i = 0;
+char buf[BUFSIZ];
+char *troff[] = { /* new troff intermediate lang */
+ "x","T","res","init","font","202","V0","p1",0};
+char *fort[] = {
+ "function","subroutine","common","dimension","block","integer",
+ "real","data","double",0};
+char *asc[] = {
+ "chmk","mov","tst","clr","jmp",0};
+char *c[] = {
+ "int","char","float","double","struct","extern",0};
+char *as[] = {
+ "globl","byte","align","text","data","comm",0};
+int ifile;
+
+main(argc, argv)
+char **argv;
+{
+ FILE *fl;
+ register char *p;
+ char ap[128];
+ extern char _sobuf[];
+
+ if (argc>1 && argv[1][0]=='-' && argv[1][1]=='f') {
+ if ((fl = fopen(argv[2], "r")) == NULL) {
+ printf("Can't open %s\n", argv[2]);
+ exit(2);
+ }
+ while ((p = fgets(ap, 128, fl)) != NULL) {
+ int l = strlen(p);
+ if (l>0)
+ p[l-1] = '\0';
+ printf("%s: ", p);
+ type(p);
+ if (ifile>=0)
+ close(ifile);
+ }
+ exit(1);
+ }
+ while(argc > 1) {
+ printf("%s: ", argv[1]);
+ type(argv[1]);
+ fflush(stdout);
+ argc--;
+ argv++;
+ if (ifile >= 0)
+ close(ifile);
+ }
+}
+
+type(file)
+char *file;
+{
+ int j,nl;
+ char ch;
+ struct stat mbuf;
+
+ ifile = -1;
+ if(stat(file, &mbuf) < 0) {
+ printf("cannot stat\n");
+ return;
+ }
+ switch (mbuf.st_mode & S_IFMT) {
+
+ case S_IFCHR:
+ printf("character");
+ goto spcl;
+
+ case S_IFDIR:
+ printf("directory\n");
+ return;
+
+ case S_IFMPC:
+ printf("char multiplexor\n");
+ return;
+
+ case S_IFMPB:
+ printf("block multiplexor\n");
+ return;
+
+ case S_IFBLK:
+ printf("block");
+
+spcl:
+ printf(" special (%d/%d)\n", major(mbuf.st_rdev), minor(mbuf.st_rdev));
+ return;
+ }
+
+ ifile = open(file, 0);
+ if(ifile < 0) {
+ printf("cannot open\n");
+ return;
+ }
+ in = read(ifile, buf, BUFSIZ);
+ if(in == 0){
+ printf("empty\n");
+ return;
+ }
+ switch(*(int *)buf) {
+
+ case 0413:
+ printf("demand paged ");
+
+ case 0410:
+ printf("pure ");
+ goto exec;
+
+ case 0411:
+ printf("jfr or pdp-11 unix 411 executable\n");
+ return;
+
+ case 0407:
+exec:
+ printf("executable");
+ if(((int *)buf)[4] != 0) {
+ printf(" not stripped");
+ if(oldo(buf))
+ printf(" (old format symbol table)");
+ }
+ printf("\n");
+ goto out;
+
+ case 0177555:
+ printf("very old archive\n");
+ goto out;
+
+ case 0177545:
+ printf("old archive\n");
+ goto out;
+ }
+
+ if(strncmp(buf, "!<arch>\n__.SYMDEF", 17) == 0 ) {
+ printf("archive random library\n");
+ goto out;
+ }
+ if (strncmp(buf, "!<arch>\n", 8)==0) {
+ printf("archive\n");
+ goto out;
+ }
+ i = 0;
+ if(ccom() == 0)goto notc;
+ while(buf[i] == '#'){
+ j = i;
+ while(buf[i++] != '\n'){
+ if(i - j > 255){
+ printf("data\n");
+ goto out;
+ }
+ if(i >= in)goto notc;
+ }
+ if(ccom() == 0)goto notc;
+ }
+check:
+ if(lookup(c) == 1){
+ while((ch = buf[i++]) != ';' && ch != '{')if(i >= in)goto notc;
+ printf("c program text");
+ goto outa;
+ }
+ nl = 0;
+ while(buf[i] != '('){
+ if(buf[i] <= 0)
+ goto notas;
+ if(buf[i] == ';'){
+ i++;
+ goto check;
+ }
+ if(buf[i++] == '\n')
+ if(nl++ > 6)goto notc;
+ if(i >= in)goto notc;
+ }
+ while(buf[i] != ')'){
+ if(buf[i++] == '\n')
+ if(nl++ > 6)goto notc;
+ if(i >= in)goto notc;
+ }
+ while(buf[i] != '{'){
+ if(buf[i++] == '\n')
+ if(nl++ > 6)goto notc;
+ if(i >= in)goto notc;
+ }
+ printf("c program text");
+ goto outa;
+notc:
+ i = 0;
+ while(buf[i] == 'c' || buf[i] == '#'){
+ while(buf[i++] != '\n')if(i >= in)goto notfort;
+ }
+ if(lookup(fort) == 1){
+ printf("fortran program text");
+ goto outa;
+ }
+notfort:
+ i=0;
+ if(ascom() == 0)goto notas;
+ j = i-1;
+ if(buf[i] == '.'){
+ i++;
+ if(lookup(as) == 1){
+ printf("assembler program text");
+ goto outa;
+ }
+ else if(buf[j] == '\n' && isalpha(buf[j+2])){
+ printf("roff, nroff, or eqn input text");
+ goto outa;
+ }
+ }
+ while(lookup(asc) == 0){
+ if(ascom() == 0)goto notas;
+ while(buf[i] != '\n' && buf[i++] != ':')
+ if(i >= in)goto notas;
+ while(buf[i] == '\n' || buf[i] == ' ' || buf[i] == '\t')if(i++ >= in)goto notas;
+ j = i-1;
+ if(buf[i] == '.'){
+ i++;
+ if(lookup(as) == 1){
+ printf("assembler program text");
+ goto outa;
+ }
+ else if(buf[j] == '\n' && isalpha(buf[j+2])){
+ printf("roff, nroff, or eqn input text");
+ goto outa;
+ }
+ }
+ }
+ printf("assembler program text");
+ goto outa;
+notas:
+ for(i=0; i < in; i++)if(buf[i]&0200){
+ if (buf[0]=='\100' && buf[1]=='\357') {
+ printf("troff (CAT) output\n");
+ goto out;
+ }
+ printf("data\n");
+ goto out;
+ }
+ if (mbuf.st_mode&((S_IEXEC)|(S_IEXEC>>3)|(S_IEXEC>>6)))
+ printf("commands text");
+ else if (troffint(buf, in))
+ printf("troff intermediate output text");
+ else if (english(buf, in))
+ printf("English text");
+ else
+ printf("ascii text");
+outa:
+ while(i < in)
+ if((buf[i++]&0377) > 127){
+ printf(" with garbage\n");
+ goto out;
+ }
+ /* if next few lines in then read whole file looking for nulls ...
+ while((in = read(ifile,buf,BUFSIZ)) > 0)
+ for(i = 0; i < in; i++)
+ if((buf[i]&0377) > 127){
+ printf(" with garbage\n");
+ goto out;
+ }
+ /*.... */
+ printf("\n");
+out:;
+}
+
+oldo(cp)
+char *cp;
+{
+ struct exec ex;
+ struct stat stb;
+
+ ex = *(struct exec *)cp;
+ if (fstat(ifile, &stb) < 0)
+ return(0);
+ if (N_STROFF(ex)+sizeof(off_t) > stb.st_size)
+ return (1);
+ return (0);
+}
+
+
+
+troffint(bp, n)
+char *bp;
+int n;
+{
+ int k;
+
+ i = 0;
+ for (k = 0; k < 6; k++) {
+ if (lookup(troff) == 0)
+ return(0);
+ if (lookup(troff) == 0)
+ return(0);
+ while (i < n && buf[i] != '\n')
+ i++;
+ if (i++ >= n)
+ return(0);
+ }
+ return(1);
+}
+lookup(tab)
+char *tab[];
+{
+ char r;
+ int k,j,l;
+ while(buf[i] == ' ' || buf[i] == '\t' || buf[i] == '\n')i++;
+ for(j=0; tab[j] != 0; j++){
+ l=0;
+ for(k=i; ((r=tab[j][l++]) == buf[k] && r != '\0');k++);
+ if(r == '\0')
+ if(buf[k] == ' ' || buf[k] == '\n' || buf[k] == '\t'
+ || buf[k] == '{' || buf[k] == '/'){
+ i=k;
+ return(1);
+ }
+ }
+ return(0);
+}
+ccom(){
+ char cc;
+ while((cc = buf[i]) == ' ' || cc == '\t' || cc == '\n')if(i++ >= in)return(0);
+ if(buf[i] == '/' && buf[i+1] == '*'){
+ i += 2;
+ while(buf[i] != '*' || buf[i+1] != '/'){
+ if(buf[i] == '\\')i += 2;
+ else i++;
+ if(i >= in)return(0);
+ }
+ if((i += 2) >= in)return(0);
+ }
+ if(buf[i] == '\n')if(ccom() == 0)return(0);
+ return(1);
+}
+ascom(){
+ while(buf[i] == '/'){
+ i++;
+ while(buf[i++] != '\n')if(i >= in)return(0);
+ while(buf[i] == '\n')if(i++ >= in)return(0);
+ }
+ return(1);
+}
+
+english (bp, n)
+char *bp;
+{
+# define NASC 128
+ int ct[NASC], j, vow, freq, rare;
+ int badpun = 0, punct = 0;
+ if (n<50) return(0); /* no point in statistics on squibs */
+ for(j=0; j<NASC; j++)
+ ct[j]=0;
+ for(j=0; j<n; j++)
+ {
+ if (bp[j]<NASC)
+ ct[bp[j]|040]++;
+ switch (bp[j])
+ {
+ case '.':
+ case ',':
+ case ')':
+ case '%':
+ case ';':
+ case ':':
+ case '?':
+ punct++;
+ if ( j < n-1 &&
+ bp[j+1] != ' ' &&
+ bp[j+1] != '\n')
+ badpun++;
+ }
+ }
+ if (badpun*5 > punct)
+ return(0);
+ vow = ct['a'] + ct['e'] + ct['i'] + ct['o'] + ct['u'];
+ freq = ct['e'] + ct['t'] + ct['a'] + ct['i'] + ct['o'] + ct['n'];
+ rare = ct['v'] + ct['j'] + ct['k'] + ct['q'] + ct['x'] + ct['z'];
+ if (2*ct[';'] > ct['e']) return(0);
+ if ( (ct['>']+ct['<']+ct['/'])>ct['e']) return(0); /* shell file test */
+ return (vow*5 >= n-ct[' '] && freq >= 10*rare);
+}
projects / unix-history / commitdiff