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0.20191010: stdio.h: add error messages
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@zvezdochiot
zvezdochiot committed Oct 11, 2019
1 parent f7c203f commit 57f6068
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Showing 3 changed files with 176 additions and 145 deletions.
5 changes: 2 additions & 3 deletions README
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Original file line number Diff line number Diff line change
Expand Up @@ -7,12 +7,11 @@ VL-LUG

BUILD

$ bash build.sh
$ make

INSTALL

$ sudo cp torread /usr/bin
$ sudo cp torwrite /usr/bin
$ sudo cp torread torwrite /usr/bin
$ sudo cp torreadwrite.1.gz /usr/share/man/man1
$ sudo ln -s /usr/share/man/man1/torreadwrite.1.gz /usr/share/man/man1/torread.1.gz
$ sudo ln -s /usr/share/man/man1/torreadwrite.1.gz /usr/share/man/man1/torwrite.1.gz
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148 changes: 82 additions & 66 deletions src/torread.c
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@
#include <sys/stat.h>
#include <sys/mman.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>

const uint8_t sp=' ';
Expand All @@ -16,7 +17,6 @@ const uint8_t elst=']';
const uint8_t bdct='(';
const uint8_t edct=')';
const uint8_t eqv='=';
const int stdout=1;

enum obj_type {OBJ_NUL, OBJ_INT, OBJ_STR, OBJ_LST, OBJ_DCT};

Expand All @@ -33,151 +33,167 @@ size_t PrintObj(const uint8_t* d, size_t shift, size_t len, int skip);
void Byte2Hex(uint8_t ch)
{
static const uint8_t cnv[]= {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
write(stdout,cnv+((ch&(15<<4))>>4),1);
write(stdout,cnv+(ch&15),1);
fwrite(cnv + (( ch & (15 << 4)) >> 4), 1, 1, stdout);
fwrite(cnv + (ch & 15), 1, 1, stdout);
}

void PrintSpc(int num)
{
int i;
for(i=0; i<num; i++) write(stdout,&sp,1);
for(i = 0; i < num; i++) fwrite(&sp, 1, 1, stdout);
}

enum obj_type DetType(const uint8_t* d, size_t shift)
{
// write(2,d+shift,1);
if(d[shift]=='i') return OBJ_INT;
if(d[shift]=='l') return OBJ_LST;
if(d[shift]=='d') return OBJ_DCT;
if(d[shift]>=49 && d[shift]<=57) return OBJ_STR;
if(d[shift] == 'i') return OBJ_INT;
if(d[shift] == 'l') return OBJ_LST;
if(d[shift] == 'd') return OBJ_DCT;
if(d[shift] >= 49 && d[shift] <= 57) return OBJ_STR;
return OBJ_NUL;
}

size_t FindSym(const uint8_t* d, uint8_t s, size_t shift, size_t len)
{
size_t i;

for(i=shift; i<len; i++) if(d[i]==s) return i;
for(i = shift; i < len; i++) if(d[i] == s) return i;
exit(2);
}

size_t PrintObj(const uint8_t* d, size_t shift, size_t len, int skip)
{
switch(DetType(d,shift))
switch(DetType(d, shift))
{
case(OBJ_NUL):
exit(2);
case(OBJ_INT):
return PrintInt(d,shift,len);
return PrintInt(d, shift, len);
case(OBJ_STR):
return PrintStr(d,shift,len);
return PrintStr(d, shift, len);
case(OBJ_LST):
return PrintLst(d,shift,len,skip);
return PrintLst(d, shift, len, skip);
case(OBJ_DCT):
return PrintDct(d,shift,len,skip);
return PrintDct(d, shift, len, skip);
}
exit(2);
}

size_t PrintInt(const uint8_t* d, size_t shift, size_t len)
{
size_t e=FindSym(d,'e',shift,len);
write(stdout,d+shift+1,e-shift-1);
size_t e = FindSym(d, 'e', shift, len);
fwrite(d + shift + 1, e - shift - 1, 1, stdout);
return e+1;
}

size_t PrintStr(const uint8_t* d, size_t shift, size_t len)
{
size_t e=FindSym(d,':',shift,len);
int l=atoi((const char*)(d+shift));
if(e+l>=len) exit(2);
size_t e = FindSym(d, ':', shift, len);
int l = atoi((const char*)(d + shift));
if(e + l >= len) exit(2);
size_t p;

write(stdout,&quo,1);
for(p=e+1; p<=e+l; p++)
fwrite(&quo, 1, 1, stdout);
for(p = e + 1; p <= e + l; p++)
{
if(d[p]==127 || d[p]<32)
if(d[p] == 127 || d[p] < 32)
{
write(stdout,&scr,1);
write(stdout,&hxp,1);
fwrite(&scr, 1, 1, stdout);
fwrite(&hxp, 1, 1, stdout);
Byte2Hex(d[p]);
}
else if(d[p]=='\\')
else if(d[p] == '\\')
{
write(stdout,&scr,1);
write(stdout,&scr,1);
fwrite(&scr, 1, 1, stdout);
fwrite(&scr, 1, 1, stdout);
}
else if(d[p]=='\"')
else if(d[p] == '\"')
{
write(stdout,&scr,1);
write(stdout,&quo,1);
fwrite(&scr, 1, 1, stdout);
fwrite(&quo, 1, 1, stdout);
}
else write(stdout,d+p,1);
else fwrite(d + p, 1, 1, stdout);
}

write(stdout,&quo,1);
return e+l+1;
fwrite(&quo, 1, 1, stdout);
return e + l + 1;
}

size_t PrintLst(const uint8_t* d, size_t shift, size_t len, int skip)
{
size_t ishift=shift+1;

write(stdout,&blst,1);
write(stdout,&ret,1);
fwrite(&blst, 1, 1, stdout);
fwrite(&ret, 1, 1, stdout);

while(d[ishift]!='e')
while(d[ishift] != 'e')
{
PrintSpc(skip+1);
ishift=PrintObj(d,ishift,len,skip+1);
write(stdout,&ret,1);
if(ishift>=len) exit(2);
PrintSpc(skip + 1);
ishift = PrintObj(d, ishift, len, skip + 1);
fwrite(&ret, 1, 1, stdout);
if(ishift >= len) exit(2);
}
PrintSpc(skip);
write(stdout,&elst,1);
return ishift+1;
fwrite(&elst, 1, 1, stdout);
return ishift + 1;
}

size_t PrintDct(const uint8_t* d, size_t shift, size_t len, int skip)
{
size_t ishift=shift+1;
size_t ishift = shift + 1;

write(stdout,&bdct,1);
write(stdout,&ret,1);
fwrite(&bdct, 1, 1, stdout);
fwrite(&ret, 1, 1, stdout);

while(d[ishift]!='e')
while(d[ishift] != 'e')
{
PrintSpc(skip+1);
if(DetType(d,ishift)!=OBJ_STR) exit(2);
ishift=PrintStr(d,ishift,len);
write(stdout,&sp,1);
write(stdout,&eqv,1);
write(stdout,&sp,1);
ishift=PrintObj(d,ishift,len,skip+1);
write(stdout,&ret,1);
if(ishift>=len) exit(2);
PrintSpc(skip + 1);
if(DetType(d, ishift) != OBJ_STR) exit(2);
ishift = PrintStr(d, ishift, len);
fwrite(&sp, 1, 1, stdout);
fwrite(&eqv, 1, 1, stdout);
fwrite(&sp, 1, 1, stdout);
ishift = PrintObj(d, ishift, len, skip + 1);
fwrite(&ret, 1, 1, stdout);
if(ishift >= len) exit(2);
}
PrintSpc(skip);
write(stdout,&edct,1);
return ishift+1;
fwrite(&edct, 1, 1, stdout);
return ishift + 1;
}

int main(int argc, char** argv)
{
if(argc!=2) return 1;
if(argc != 2)
{
fprintf(stderr, "Usage: %s file.torrent > file.torrent.txt", argv[0]);
return 1;
}

int fd;
struct stat st;
uint8_t *pdata;

fd=open(argv[1],O_RDONLY);
if(fd==-1) return 1;
if(fstat(fd,&st)!=0) return 1;
if(st.st_size==0) return 1;
pdata=(uint8_t*) mmap(0,st.st_size,PROT_READ,MAP_SHARED,fd,0);
PrintDct(pdata,0,st.st_size,0);
write(stdout,&ret,1);
munmap(pdata,st.st_size);
fd = open(argv[1],O_RDONLY);
if(fd == -1)
{
fprintf(stderr, "ERROR: Can't open %s", argv[1]);
return 1;
}
if(fstat(fd, &st) != 0)
{
fprintf(stderr, "ERROR: Can't read %s", argv[1]);
return 1;
}
if(st.st_size == 0)
{
fprintf(stderr, "ERROR: File %s empty", argv[1]);
return 1;
}
pdata = (uint8_t*) mmap(0, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
PrintDct(pdata, 0, st.st_size, 0);
fwrite(&ret, 1, 1, stdout);
munmap(pdata, st.st_size);
close(fd);

return 0;
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