talloc_string - Man Page

The talloc debugging support functions

_PUBLIC_ char * talloc_strdup (const void *t, const char *p)
Duplicate a string into a talloc chunk.
_PUBLIC_ char * talloc_strdup_append (char *s, const char *a)
Append a string to given string.
_PUBLIC_ char * talloc_strdup_append_buffer (char *s, const char *a)
Append a string to a given buffer.
_PUBLIC_ char * talloc_strndup (const void *t, const char *p, size_t n)
Duplicate a length-limited string into a talloc chunk.
_PUBLIC_ char * talloc_strndup_append (char *s, const char *a, size_t n)
Append at most n characters of a string to given string.
_PUBLIC_ char * talloc_strndup_append_buffer (char *s, const char *a, size_t n)
Append at most n characters of a string to given buffer.
_PUBLIC_ char * talloc_vasprintf (const void *t, const char *fmt, va_list ap)
Format a string given a va_list.
_PUBLIC_ char * talloc_vasprintf_append (char *s, const char *fmt, va_list ap)
Format a string given a va_list and append it to the given destination string.
_PUBLIC_ char * talloc_vasprintf_append_buffer (char *s, const char *fmt, va_list ap)
Format a string given a va_list and append it to the given destination buffer.
_PUBLIC_ void talloc_asprintf_addbuf (char **ps, const char *fmt,...)
Build up a string buffer, handle allocation failure.
_PUBLIC_ char * talloc_asprintf (const void *t, const char *fmt,...)
Format a string.
_PUBLIC_ char * talloc_asprintf_append (char *s, const char *fmt,...)
Append a formatted string to another string.
_PUBLIC_ char * talloc_asprintf_append_buffer (char *s, const char *fmt,...)
Append a formatted string to another string.

Format a string. This function is the talloc equivalent of the C library function asprintf(3).

This functions sets the name of the new pointer to the new string. This is equivalent to:

talloc_set_name_const(ptr, ptr)

Parameters

t The talloc context to hang the result off.
fmt The format string.
... The parameters used to fill fmt.

Returns

The formatted string, NULL on error.

Build up a string buffer, handle allocation failure.

Parameters

ps Pointer to the talloc'ed string to be extended
fmt The format string
... The parameters used to fill fmt.

This does nothing if *ps is NULL and sets *ps to NULL if the intermediate reallocation fails. Useful when building up a string step by step, no intermediate NULL checks are required.

Append a formatted string to another string. This function appends the given formatted string to the given string. Use this variant when the string in the current talloc buffer may have been truncated in length.

This functions sets the name of the new pointer to the new string. This is equivalent to:

talloc_set_name_const(ptr, ptr)

If s == NULL then new context is created.

Parameters

s The string to append to.
fmt The format string.
... The parameters used to fill fmt.

Returns

The formatted string, NULL on error.

Append a formatted string to another string. This is a more efficient version of talloc_asprintf_append(). It determines the length of the destination string by the size of the talloc context.

Use this very carefully as it produces a different result than talloc_asprintf_append() when a zero character is in the middle of the destination string.

char *str_a = talloc_strdup(NULL, "hello world");
char *str_b = talloc_strdup(NULL, "hello world");
str_a[5] = str_b[5] = '\0'

char *app = talloc_asprintf_append(str_a, "%s", ", hello");
char *buf = talloc_strdup_append_buffer(str_b, "%s", ", hello");

printf("%s\n", app); // hello, hello (app = "hello, hello")
printf("%s\n", buf); // hello (buf = "hello\0world, hello")

If s == NULL then new context is created.

Parameters

s The string to append to
fmt The format string.
... The parameters used to fill fmt.

Returns

The formatted string, NULL on error.

See also

talloc_asprintf()

talloc_asprintf_append()

Duplicate a string into a talloc chunk. This function is equivalent to:

ptr = talloc_size(ctx, strlen(p)+1);
if (ptr) memcpy(ptr, p, strlen(p)+1);

This functions sets the name of the new pointer to the passed string. This is equivalent to:

talloc_set_name_const(ptr, ptr)

Parameters

t The talloc context to hang the result off.
p The string you want to duplicate.

Returns

The duplicated string, NULL on error.

Append a string to given string. The destination string is reallocated to take strlen(s) + strlen(a) + 1 characters.

This functions sets the name of the new pointer to the new string. This is equivalent to:

talloc_set_name_const(ptr, ptr)

If s == NULL then new context is created.

Parameters

s The destination to append to.
a The string you want to append.

Returns

The concatenated strings, NULL on error.

See also

talloc_strdup()

talloc_strdup_append_buffer()

Append a string to a given buffer. This is a more efficient version of talloc_strdup_append(). It determines the length of the destination string by the size of the talloc context.

Use this very carefully as it produces a different result than talloc_strdup_append() when a zero character is in the middle of the destination string.

char *str_a = talloc_strdup(NULL, "hello world");
char *str_b = talloc_strdup(NULL, "hello world");
str_a[5] = str_b[5] = '\0'

char *app = talloc_strdup_append(str_a, ", hello");
char *buf = talloc_strdup_append_buffer(str_b, ", hello");

printf("%s\n", app); // hello, hello (app = "hello, hello")
printf("%s\n", buf); // hello (buf = "hello\0world, hello")

If s == NULL then new context is created.

Parameters

s The destination buffer to append to.
a The string you want to append.

Returns

The concatenated strings, NULL on error.

See also

talloc_strdup()

talloc_strdup_append()

talloc_array_length()

Duplicate a length-limited string into a talloc chunk. This function is the talloc equivalent of the C library function strndup(3).

This functions sets the name of the new pointer to the passed string. This is equivalent to:

talloc_set_name_const(ptr, ptr)

Parameters

t The talloc context to hang the result off.
p The string you want to duplicate.
n The maximum string length to duplicate.

Returns

The duplicated string, NULL on error.

Append at most n characters of a string to given string. The destination string is reallocated to take strlen(s) + strnlen(a, n) + 1 characters.

This functions sets the name of the new pointer to the new string. This is equivalent to:

talloc_set_name_const(ptr, ptr)

If s == NULL then new context is created.

Parameters

s The destination string to append to.
a The source string you want to append.
n The number of characters you want to append from the string.

Returns

The concatenated strings, NULL on error.

See also

talloc_strndup()

talloc_strndup_append_buffer()

Append at most n characters of a string to given buffer. This is a more efficient version of talloc_strndup_append(). It determines the length of the destination string by the size of the talloc context.

Use this very carefully as it produces a different result than talloc_strndup_append() when a zero character is in the middle of the destination string.

char *str_a = talloc_strdup(NULL, "hello world");
char *str_b = talloc_strdup(NULL, "hello world");
str_a[5] = str_b[5] = '\0'

char *app = talloc_strndup_append(str_a, ", hello", 7);
char *buf = talloc_strndup_append_buffer(str_b, ", hello", 7);

printf("%s\n", app); // hello, hello (app = "hello, hello")
printf("%s\n", buf); // hello (buf = "hello\0world, hello")

If s == NULL then new context is created.

Parameters

s The destination buffer to append to.
a The source string you want to append.
n The number of characters you want to append from the string.

Returns

The concatenated strings, NULL on error.

See also

talloc_strndup()

talloc_strndup_append()

talloc_array_length()

Format a string given a va_list. This function is the talloc equivalent of the C library function vasprintf(3).

This functions sets the name of the new pointer to the new string. This is equivalent to:

talloc_set_name_const(ptr, ptr)

Parameters

t The talloc context to hang the result off.
fmt The format string.
ap The parameters used to fill fmt.

Returns

The formatted string, NULL on error.

Format a string given a va_list and append it to the given destination string.

Parameters

s The destination string to append to.
fmt The format string.
ap The parameters used to fill fmt.

Returns

The formatted string, NULL on error.

See also

talloc_vasprintf()

Format a string given a va_list and append it to the given destination string.

Good for gradually accumulating output into a string buffer. Appends at the end of the string.

Format a string given a va_list and append it to the given destination buffer.

Parameters

s The destination buffer to append to.
fmt The format string.
ap The parameters used to fill fmt.

Returns

The formatted string, NULL on error.

See also

talloc_vasprintf()

Format a string given a va_list and append it to the given destination buffer.

Always appends at the end of the talloc'ed buffer, not the end of the string.