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seq_file: introduce seq_escape_mem() 

Introduce seq_escape_mem() to allow users to pass additional parameters to
string_escape_mem().

Link: https://lkml.kernel.org/r/20210504180819.73127-12-andriy.shevchenko@linux.intel.com
Suggested-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Chuck Lever <chuck.lever@oracle.com>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andy Shevchenko 2021-06-30 18:55:34 -07:00 committed by Linus Torvalds
parent be613b4025
commit 1d31aa172a
2 changed files with 27 additions and 0 deletions
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25
fs/seq_file.c
View File

@ -355,6 +355,31 @@ int seq_release(struct inode *inode, struct file *file)
} }
EXPORT_SYMBOL(seq_release); EXPORT_SYMBOL(seq_release);
/**
* seq_escape_mem - print data into buffer, escaping some characters
* @m: target buffer
* @src: source buffer
* @len: size of source buffer
* @flags: flags to pass to string_escape_mem()
* @esc: set of characters that need escaping
*
* Puts data into buffer, replacing each occurrence of character from
* given class (defined by @flags and @esc) with printable escaped sequence.
*
* Use seq_has_overflowed() to check for errors.
*/
void seq_escape_mem(struct seq_file *m, const char *src, size_t len,
unsigned int flags, const char *esc)
{
char *buf;
size_t size = seq_get_buf(m, &buf);
int ret;
ret = string_escape_mem(src, len, buf, size, flags, esc);
seq_commit(m, ret < size ? ret : -1);
}
EXPORT_SYMBOL(seq_escape_mem);
/** /**
* seq_escape - print string into buffer, escaping some characters * seq_escape - print string into buffer, escaping some characters
* @m: target buffer * @m: target buffer

2
include/linux/seq_file.h
View File

@ -126,6 +126,8 @@ void seq_put_decimal_ll(struct seq_file *m, const char *delimiter, long long num
void seq_put_hex_ll(struct seq_file *m, const char *delimiter, void seq_put_hex_ll(struct seq_file *m, const char *delimiter,
unsigned long long v, unsigned int width); unsigned long long v, unsigned int width);
void seq_escape_mem(struct seq_file *m, const char *src, size_t len,
unsigned int flags, const char *esc);
void seq_escape(struct seq_file *m, const char *s, const char *esc); void seq_escape(struct seq_file *m, const char *s, const char *esc);
void seq_escape_mem_ascii(struct seq_file *m, const char *src, size_t isz); void seq_escape_mem_ascii(struct seq_file *m, const char *src, size_t isz);