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btrfs-progs: send dump: introduce helper for printing escaped path

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The send dump prints one line per stream operation, we'd like to prevent
any line breakage, so the characters are printed escaped in the C style.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2016-11-07 11:42:02 +01:00
parent fad531e523
commit 637563be3c
1 changed files with 42 additions and 0 deletions
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42
send-dump.c
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@ -28,6 +28,7 @@
#include <limits.h>
#include <stdlib.h>
#include <time.h>
#include <ctype.h>
#include <asm/types.h>
#include <uuid/uuid.h>
#include "utils.h"
@ -45,6 +46,47 @@
} \
})
/*
* Print path and escape chaacters (in a C way) that could break the line.
* Returns the length of the escaped characters. Unprintable characters are
* escaped as octals.
*/
static int print_path_escaped(const char *path)
{
size_t i;
size_t path_len = strlen(path);
int len = 0;
for (i = 0; i < path_len; i++) {
char c = path[i];
len++;
switch (c) {
case '\a': putchar('\\'); putchar('a'); len++; break;
case '\b': putchar('\\'); putchar('b'); len++; break;
case '\e': putchar('\\'); putchar('e'); len++; break;
case '\f': putchar('\\'); putchar('f'); len++; break;
case '\n': putchar('\\'); putchar('n'); len++; break;
case '\r': putchar('\\'); putchar('r'); len++; break;
case '\t': putchar('\\'); putchar('t'); len++; break;
case '\v': putchar('\\'); putchar('v'); len++; break;
case ' ': putchar('\\'); putchar(' '); len++; break;
case '\\': putchar('\\'); putchar('\\'); len++; break;
default:
if (!isprint(c)) {
printf("\\%c%c%c",
'0' + ((c & 0300) >> 6),
'0' + ((c & 070) >> 3),
'0' + (c & 07));
len += 3;
} else {
putchar(c);
}
}
}
return len;
}
/*
* Underlying PRINT_DUMP, the only difference is how we handle
* the full path.