STRCSTR(3) C Programmer's Manual STRCSTR(3)NAMEstrcstr - convert memory block to printable C string notation
SYNOPSIS
#include <publib.h>
void strcstr(char *str, size_t max, const void *block, size_t n);
DESCRIPTIONstrcstr converts the contents of an arbitrary memory block (which need
not be a zero terminated string) into a printable notation using normal
C string literal syntax. This can be used for example to store poten‐
tially binary data in a file, or in debugging outputs.
All characters for which there is a simple shorthand escape sequence
(', ", ?, \, \a, \b, \f, \n, \r, \t, \v) are stored using that nota‐
tion. \0 is stored as \0. All other non-printable characters are
stored using a hexadecimal escape sequence. All other printable char‐
acters are stored as is.
The isprint(3) macro is used to determine whether a character is print‐
able (i.e., whether it is printed as is, or using special notation).
Therefore, the output depends on the locale.
RETURN VALUEstrcstr returns nothing.
EXAMPLE
The following code dumps input to the standard output in a guaranteed
(modulo locale bugs) printable format. It might be used for debugging.
#include <stdio.h>
#include <publib.h>
int main(void) {
char line[512];
char cstr[512*(CHAR_BIT/4+1+2)+1]; /* +2 for \x, +1 for \0,
the rest to be able to
store the hex code for
512 chars. */
while (fgets(line, sizeof(line), stdin) != NULL) {
strcstr(cstr, sizeof(cstr), line, strlen(line));
printf("%s0, cstr);
}
return 0;
}
SEE ALSOpublib(3), strins(3)AUTHOR
Lars Wirzenius (lars.wirzenius@helsinki.fi)
Publib C Programmer's Manual STRCSTR(3)
