mirror of
https://github.com/bobbimanners/GNO-Extras.git
synced 2024-12-23 09:29:34 +00:00
331 lines
6.5 KiB
Plaintext
331 lines
6.5 KiB
Plaintext
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/*
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* determine type of file
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*/
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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int main(int, char**);
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int type(char*);
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int ascom(void);
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int ccom(void);
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int english (char *bp, int n);
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int lookup(char *tab[]);
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int in;
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int i = 0;
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char buf[512];
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char *fort[] = {
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"function","subroutine","common","dimension","block","integer",
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"real","data","double",0};
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char *asc[] = {
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"sys","mov","tst","clr","jmp",0};
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char *c[] = {
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"int","char","float","double","struct","extern",0};
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char *as[] = {
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"globl","byte","even","text","data","bss","comm",0};
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int ifile;
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int main(int argc, char **argv)
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{
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FILE *fl;
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register char *p;
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char ap[128];
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if (argc>1 && argv[1][0]=='-' && argv[1][1]=='f') {
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if ((fl = fopen(argv[2], "r")) == NULL) {
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printf("Can't open %s\n", argv[2]);
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exit(2);
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}
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while ((p = fgets(ap, 128, fl)) != NULL) {
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int l = strlen(p);
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if (l>0)
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p[l-1] = '\0';
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printf("%s: ", p);
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type(p);
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if (ifile>=0)
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close(ifile);
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}
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exit(1);
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}
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while(argc > 1) {
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printf("%s: ", argv[1]);
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type(argv[1]);
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argc--;
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argv++;
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if (ifile >= 0)
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close(ifile);
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}
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}
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int type(char *file)
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{
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int j,nl;
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char ch;
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struct stat mbuf;
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ifile = -1;
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if(stat(file, &mbuf) < 0) {
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printf("cannot stat\n");
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return;
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}
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switch (mbuf.st_mode & S_IFMT) {
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case S_IFCHR:
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printf("character");
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goto spcl;
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case S_IFDIR:
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printf("directory\n");
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return;
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case S_IFBLK:
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printf("block");
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spcl:
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printf(" special (%d/%d)\n", major(mbuf.st_rdev), minor(mbuf.st_rdev));
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return;
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}
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ifile = open(file, 0);
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if(ifile < 0) {
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printf("cannot open\n");
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return;
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}
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in = read(ifile, buf, 512);
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if(in == 0){
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printf("empty\n");
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return;
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}
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switch(*(int *)buf) {
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case 0410:
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printf("pure ");
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goto exec;
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case 0411:
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printf("separate ");
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case 0407:
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exec:
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printf("executable");
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if(((int *)buf)[4] != 0)
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printf(" not stripped");
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printf("\n");
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goto out;
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case 0177555:
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printf("old archive\n");
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goto out;
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case 0177545:
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printf("archive\n");
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goto out;
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}
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i = 0;
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if(ccom() == 0)goto notc;
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while(buf[i] == '#'){
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j = i;
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while(buf[i++] != '\n'){
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if(i - j > 255){
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printf("data\n");
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goto out;
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}
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if(i >= in)goto notc;
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}
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if(ccom() == 0)goto notc;
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}
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check:
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if(lookup(c) == 1){
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while((ch = buf[i++]) != ';' && ch != '{')if(i >= in)goto notc;
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printf("c program text");
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goto outa;
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}
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nl = 0;
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while(buf[i] != '('){
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if(buf[i] <= 0)
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goto notas;
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if(buf[i] == ';'){
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i++;
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goto check;
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}
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if(buf[i++] == '\n')
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if(nl++ > 6)goto notc;
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if(i >= in)goto notc;
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}
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while(buf[i] != ')'){
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if(buf[i++] == '\n')
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if(nl++ > 6)goto notc;
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if(i >= in)goto notc;
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}
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while(buf[i] != '{'){
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if(buf[i++] == '\n')
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if(nl++ > 6)goto notc;
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if(i >= in)goto notc;
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}
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printf("c program text");
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goto outa;
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notc:
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i = 0;
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while(buf[i] == 'c' || buf[i] == '#'){
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while(buf[i++] != '\n')if(i >= in)goto notfort;
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}
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if(lookup(fort) == 1){
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printf("fortran program text");
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goto outa;
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}
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notfort:
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i=0;
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if(ascom() == 0)goto notas;
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j = i-1;
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if(buf[i] == '.'){
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i++;
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if(lookup(as) == 1){
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printf("assembler program text");
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goto outa;
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}
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else if(buf[j] == '\n' && isalpha(buf[j+2])){
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printf("roff, nroff, or eqn input text");
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goto outa;
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}
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}
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while(lookup(asc) == 0){
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if(ascom() == 0)goto notas;
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while(buf[i] != '\n' && buf[i++] != ':')
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if(i >= in)goto notas;
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while(buf[i] == '\n' || buf[i] == ' ' || buf[i] == '\t')if(i++ >= in)goto notas;
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j = i-1;
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if(buf[i] == '.'){
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i++;
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if(lookup(as) == 1){
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printf("assembler program text");
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goto outa;
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}
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else if(buf[j] == '\n' && isalpha(buf[j+2])){
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printf("roff, nroff, or eqn input text");
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goto outa;
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}
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}
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}
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printf("assembler program text");
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goto outa;
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notas:
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for(i=0; i < in; i++)if(buf[i]&0200){
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if (buf[0]=='\100' && buf[1]=='\357') {
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printf("troff output\n");
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goto out;
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}
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printf("data\n");
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goto out;
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}
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if (mbuf.st_mode&((S_IEXEC)|(S_IEXEC>>3)|(S_IEXEC>>6)))
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printf("commands text");
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else
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if (english(buf, in))
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printf("English text");
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else
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printf("ascii text");
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outa:
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while(i < in)
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if((buf[i++]&0377) > 127){
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printf(" with garbage\n");
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goto out;
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}
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/* if next few lines in then read whole file looking for nulls ...
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while((in = read(ifile,buf,512)) > 0)
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for(i = 0; i < in; i++)
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if((buf[i]&0377) > 127){
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printf(" with garbage\n");
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goto out;
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}
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/*.... */
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printf("\n");
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out:;
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}
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int lookup(char *tab[])
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{
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char r;
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int k,j,l;
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while(buf[i] == ' ' || buf[i] == '\t' || buf[i] == '\n')i++;
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for(j=0; tab[j] != 0; j++){
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l=0;
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for(k=i; ((r=tab[j][l++]) == buf[k] && r != '\0');k++);
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if(r == '\0')
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if(buf[k] == ' ' || buf[k] == '\n' || buf[k] == '\t'
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|| buf[k] == '{' || buf[k] == '/'){
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i=k;
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return(1);
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}
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}
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return(0);
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}
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int ccom(void){
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char cc;
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while((cc = buf[i]) == ' ' || cc == '\t' || cc == '\n')if(i++ >= in)return(0);
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if(buf[i] == '/' && buf[i+1] == '*'){
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i += 2;
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while(buf[i] != '*' || buf[i+1] != '/'){
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if(buf[i] == '\\')i += 2;
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else i++;
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if(i >= in)return(0);
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}
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if((i += 2) >= in)return(0);
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}
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if(buf[i] == '\n')if(ccom() == 0)return(0);
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return(1);
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}
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int ascom(void){
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while(buf[i] == '/'){
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i++;
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while(buf[i++] != '\n')if(i >= in)return(0);
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while(buf[i] == '\n')if(i++ >= in)return(0);
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}
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return(1);
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}
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int english (char *bp, int n)
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{
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# define NASC 128
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int ct[NASC], j, vow, freq, rare;
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int badpun = 0, punct = 0;
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if (n<50) return(0); /* no point in statistics on squibs */
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for(j=0; j<NASC; j++)
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ct[j]=0;
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for(j=0; j<n; j++)
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{
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if (bp[j]<NASC)
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ct[bp[j]|040]++;
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switch (bp[j])
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{
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case '.':
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case ',':
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case ')':
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case '%':
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case ';':
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case ':':
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case '?':
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punct++;
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if ( j < n-1 &&
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bp[j+1] != ' ' &&
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bp[j+1] != '\n')
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badpun++;
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}
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}
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if (badpun*5 > punct)
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return(0);
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vow = ct['a'] + ct['e'] + ct['i'] + ct['o'] + ct['u'];
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freq = ct['e'] + ct['t'] + ct['a'] + ct['i'] + ct['o'] + ct['n'];
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rare = ct['v'] + ct['j'] + ct['k'] + ct['q'] + ct['x'] + ct['z'];
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if (2*ct[';'] > ct['e']) return(0);
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if ( (ct['>']+ct['<']+ct['/'])>ct['e']) return(0); /* shell file test */
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return (vow*5 >= n-ct[' '] && freq >= 10*rare);
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}
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