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#include <ctype.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void usage(){
fprintf(stderr,
"Usage: c2bin [inputfile] [outputfile]\n"
"\n"
"Converts a C string to its parsed contents. The inverse of bin2c.\n"
"Default values for the arguments are stdin and stdout; also '-' indicates the\n"
"standard stream.\n");
}
int unhex(int c){
if(c>='0'&&c<='9'){
return c-'0';
} else if(c>='a'&&c<='f'){
return c-'a'+10;
} else if(c>='A'&&c<='F'){
return c-'A'+10;
} else {
return -1;
}
}
void c2bin(FILE *input,FILE *output){
bool stringmode=false;
int c;
while((c=fgetc(input))!=EOF){
if(c=='"'){
stringmode=!stringmode;
} else if(!stringmode){
if(!isspace(c)){
fprintf(stderr,"Characters outside string\n");
exit(1);
}
} else if(c=='\n'){
fprintf(stderr,"Invalid newline in string\n");
exit(1);
} else if(c!='\\'){
fputc(c,output);
} else {
c=fgetc(input);
if(c==EOF){
fprintf(stderr,"Invalid backslash at end of input\n");
exit(1);
} else if(c=='\n'){
continue;
} else if(c!='x'&&!isdigit(c)){
switch(c){
case 'a': fputc('\a',output); break;
case 'b': fputc('\b',output); break;
case 'f': fputc('\f',output); break;
case 'n': fputc('\n',output); break;
case 'r': fputc('\r',output); break;
case 't': fputc('\t',output); break;
case 'v': fputc('\v',output); break;
default: fputc(c,output); break;
}
} else if(c=='x'){
int c1=fgetc(input);
int c2=fgetc(input);
if(c1==-1||c2==-1){
fprintf(stderr,"Invalid end of input\n");
exit(1);
}
c1=unhex(c1);
c2=unhex(c2);
if(c1==-1){
fprintf(stderr,"Invalid hexadecimal escape\n");
exit(1);
}
if(c2==-1){
fputc(c1,output);
} else {
c=fgetc(input);
if(c==-1){
fprintf(stderr,"Invalid end of input\n");
exit(1);
}
if(unhex(c)!=-1){
fprintf(stderr,"Invalid wide hexadecimal escape\n");
exit(1);
}
ungetc(c,input);
fputc(16*c1+c2,output);
}
} else {
ungetc(c,input);
int res=0,i;
for(i=0;i<3;i++){
c=fgetc(input);
if(c==EOF){
fprintf(stderr,"Invalid end of input\n");
exit(1);
}
if(c<'0'||c>='8'){
ungetc(c,input);
break;
}
res=8*res+c-'0';
}
if(i==0){
fprintf(stderr,"Invalid octal escape\n");
exit(1);
}
fputc(res,output);
}
}
fflush(output);
}
}
int main(int argc,char **argv){
if(argc==1){
c2bin(stdin,stdout);
} else if(argc==2){
if(strcmp(argv[1],"-h")==0||strcmp(argv[1],"--help")==0){
usage();
} else if(strcmp(argv[1],"-")==0){
c2bin(stdin,stdout);
} else {
FILE *f=fopen(argv[1],"rb");
if(!f){
fprintf(stderr,"Could not open file '%s'\n",argv[1]);
return 1;
}
c2bin(f,stdout);
fclose(f);
}
} else if(argc==3){
FILE *fin,*fout;
if(strcmp(argv[1],"-")==0){
fin=stdin;
} else {
fin=fopen(argv[1],"rb");
if(!fin){
fprintf(stderr,"Could not open file '%s'\n",argv[1]);
return 1;
}
}
if(strcmp(argv[2],"-")==0){
fout=stdout;
} else {
fout=fopen(argv[2],"wb");
if(!fout){
fprintf(stderr,"Could not open file '%s'\n",argv[2]);
return 1;
}
}
c2bin(fin,fout);
fclose(fin);
fclose(fout);
} else {
usage();
return 1;
}
}
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