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Just some things to consider when crafting a pwn payload...
Notes
-----
* The functions documented here require: stdio.h, unistd.h
* The terminator 'space' means any whitespace, newline, tab, etc.
* '?' on an output terminator means it is only sometimes present, see notes.
* See man 2/3 <function> for complete information
[INPUT]
Function Arguments Return val Input terminators Output terminators Source Notes
===================================================================================================================================================================================================
gets (char*)dest dest, NULL '\n', EOF '\0' STDIN No check for buffer overrun
scanf(%s) (char*)format, ... # matched items, EOF space, maxlen, EOF '\0' STDIN No check for buffer overrun
fgets (char*)dest, (int)size, (FILE*)src dest, NULL '\n', maxlen, EOF '\n'? '\0' src Newline char stored into output if read
read (int)fd, (void*)dest, (size_t)size # bytes read, -1 maxlen, EOF [none] fd Binary IO, may read < size or follow-up input if available
[OUTPUT]
Function Arguments Return val Input terminators Output terminators Dest Notes
===================================================================================================================================================================================================
puts (char*)str >=0, EOF '\0' '\n' STDOUT Extra newline char is always appended
printf(%s) (char*)format, ... # chars printed, <0 '\0' [none] STDOUT Output controlled by format string
fputs (char*)str, (FILE*)dest >=0, EOF '\0' [none] dest Unlike puts(), does not append '\n'
write (int)fd, (void*)src, (size_t)size # bytes written, -1 maxlen [none] fd Binary IO, may write < size under certain conditions
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