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move the dynamic string support in a better place i.e. string.h

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While doing this, add a bit of documentation, and slightly
extend the functionality as follows:
 + a max_len of -1 means that we take whatever the current size
   is, and never try to extend the buffer;
 + add support for alloca()-ted dynamic strings, which is very
   useful for all cases where we do an ast_build_string() now.

Next step is to simplify the interface by using shorter names
(e.g. ast_str as a prefix) and removing the _thread variant
of the functions by saving the threadstorage reference into
the struct ast_str. This can be done by overloading the
'type' field.

Finally, I will do my best to remove the convoluted interface
that results from trying to support platforms without va_copy().



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@48509 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Luigi Rizzo
2006-12-15 22:08:46 +00:00
parent 4a0738a665
commit 961754d4b1
4 changed files with 431 additions and 345 deletions
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396
include/asterisk/strings.h
View File

@@ -29,6 +29,8 @@
#include "asterisk/inline_api.h"
#include "asterisk/compiler.h"
#include "asterisk/compat.h"
#include "asterisk/utils.h"
#include "asterisk/threadstorage.h"
static force_inline int ast_strlen_zero(const char *s)
{
@@ -256,4 +258,398 @@ struct ast_realloca {
(ra)->ptr; \
})
/*!
* Support for dynamic strings.
*
* A dynamic string is just a C string prefixed by a few control fields
* that help setting/appending/extending it using a printf-like syntax.
*
* One should never declare a variable with this type, but only a pointer
* to it, e.g.
*
* struct ast_dynamic_str *ds;
*
* The pointer can be initialized with the following:
*
* ds = ast_dynamic_str_create(init_len);
* creates a malloc()'ed dynamic string;
*
* ds = ast_dynamic_str_alloca(init_len);
* creates a string on the stack (not very dynamic!).
*
* ds = ast_dynamic_str_thread_get(ts, init_len)
* creates a malloc()'ed dynamic string associated to
* the thread-local storage key ts
*
* Finally, the string can be manipulated with the following:
*
* ast_dynamic_str_set(&buf, max_len, ts, fmt, ...)
* ast_dynamic_str_append(&buf, max_len, ts, fmt, ...)
* ast_dynamic_str_thread_set(&buf, max_len, ts, fmt, ...)
* ast_dynamic_str_thread_append(&buf, max_len, ts, fmt, ...)
*
* and their varargs format.
*
* \arg max_len The maximum allowed length, reallocating if needed.
* 0 means unlimited, -1 means "at most the available space"
*
* XXX the [_thread] variants can be removed if we save the ts in the
* string descriptor.
*/
/*! \brief type of storage used for dynamic string */
enum dynstr_type {
DS_MALLOC = 1,
DS_ALLOCA = 2,
DS_STATIC = 3, /* XXX not supported yet */
};
/*! \brief The descriptor of a dynamic string
* XXX storage will be optimized later if needed
*/
struct ast_dynamic_str {
size_t len; /*!< The current maximum length of the string */
size_t used; /*!< Amount of space used */
enum dynstr_type type; /*!< What kind of storage is this ? */
char str[0]; /*!< The string buffer */
};
/*!
* \brief Create a malloc'ed dynamic length string
*
* \arg init_len This is the initial length of the string buffer
*
* \return This function returns a pointer to the dynamic string length. The
* result will be NULL in the case of a memory allocation error.
*
* \note The result of this function is dynamically allocated memory, and must
* be free()'d after it is no longer needed.
*/
AST_INLINE_API(
struct ast_dynamic_str * attribute_malloc ast_dynamic_str_create(size_t init_len),
{
struct ast_dynamic_str *buf;
if (!(buf = ast_calloc(1, sizeof(*buf) + init_len)))
return NULL;
buf->len = init_len;
buf->used = 0;
buf->type = DS_MALLOC;
return buf;
}
)
#define ast_dynamic_str_alloca(init_len) \
({ \
struct ast_dynamic_str *buf; \
buf = alloca(sizeof(*buf) + init_len); \
buf->len = init_len; \
buf->used = 0; \
buf->type = DS_ALLOCA; \
buf->str[0] = '\0'; \
(buf); \
})
/*!
* \brief Retrieve a thread locally stored dynamic string
*
* \arg ts This is a pointer to the thread storage structure declared by using
* the AST_THREADSTORAGE macro. If declared with
* AST_THREADSTORAGE(my_buf, my_buf_init), then this argument would be
* (&my_buf).
* \arg init_len This is the initial length of the thread's dynamic string. The
* current length may be bigger if previous operations in this thread have
* caused it to increase.
*
* \return This function will return the thread locally stored dynamic string
* associated with the thread storage management variable passed as the
* first argument.
* The result will be NULL in the case of a memory allocation error.
*
* Example usage:
* \code
* AST_THREADSTORAGE(my_str, my_str_init);
* #define MY_STR_INIT_SIZE 128
* ...
* void my_func(const char *fmt, ...)
* {
* struct ast_dynamic_str *buf;
*
* if (!(buf = ast_dynamic_str_thread_get(&my_str, MY_STR_INIT_SIZE)))
* return;
* ...
* }
* \endcode
*/
AST_INLINE_API(
struct ast_dynamic_str *ast_dynamic_str_thread_get(struct ast_threadstorage *ts,
size_t init_len),
{
struct ast_dynamic_str *buf;
if (!(buf = ast_threadstorage_get(ts, sizeof(*buf) + init_len)))
return NULL;
if (!buf->len) {
buf->len = init_len;
buf->used = 0;
buf->type = DS_MALLOC;
}
return buf;
}
)
/*!
* \brief Error codes from __ast_dyn_str_helper()
* The undelying processing to manipulate dynamic string is done
* by __ast_dyn_str_helper(), which can return a success, a
* permanent failure (e.g. no memory), or a temporary one (when
* the string needs to be reallocated, and we must run va_start()
* again; XXX this convoluted interface is only here because
* FreeBSD 4 lacks va_copy, but this will be fixed and the
* interface simplified).
*/
enum {
/*! An error has occured and the contents of the dynamic string
* are undefined */
AST_DYNSTR_BUILD_FAILED = -1,
/*! The buffer size for the dynamic string had to be increased, and
* ast_dynamic_str_thread_build_va() needs to be called again after
* a va_end() and va_start().
*/
AST_DYNSTR_BUILD_RETRY = -2
};
/*!
* \brief Set a thread locally stored dynamic string from a va_list
*
* \arg buf This is the address of a pointer to an ast_dynamic_str which should
* have been retrieved using ast_dynamic_str_thread_get. It will need to
* be updated in the case that the buffer has to be reallocated to
* accommodate a longer string than what it currently has space for.
* \arg max_len This is the maximum length to allow the string buffer to grow
* to. If this is set to 0, then there is no maximum length.
* \arg ts This is a pointer to the thread storage structure declared by using
* the AST_THREADSTORAGE macro. If declared with
* AST_THREADSTORAGE(my_buf, my_buf_init), then this argument would be
* (&my_buf).
* \arg fmt This is the format string (printf style)
* \arg ap This is the va_list
*
* \return The return value of this function is the same as that of the printf
* family of functions.
*
* Example usage:
* \code
* AST_THREADSTORAGE(my_str, my_str_init);
* #define MY_STR_INIT_SIZE 128
* ...
* void my_func(const char *fmt, ...)
* {
* struct ast_dynamic_str *buf;
* va_list ap;
*
* if (!(buf = ast_dynamic_str_thread_get(&my_str, MY_STR_INIT_SIZE)))
* return;
* ...
* va_start(fmt, ap);
* ast_dynamic_str_thread_set_va(&buf, 0, &my_str, fmt, ap);
* va_end(ap);
*
* printf("This is the string we just built: %s\n", buf->str);
* ...
* }
* \endcode
*
* \note: the following two functions must be implemented as macros
* because we must do va_end()/va_start() on the original arguments.
*/
#define ast_dynamic_str_thread_set_va(buf, max_len, ts, fmt, ap) \
({ \
int __res; \
while ((__res = __ast_dyn_str_helper(buf, max_len, \
ts, 0, fmt, ap)) == AST_DYNSTR_BUILD_RETRY) { \
va_end(ap); \
va_start(ap, fmt); \
} \
(__res); \
})
/*!
* \brief Append to a thread local dynamic string using a va_list
*
* The arguments, return values, and usage of this are the same as those for
* ast_dynamic_str_thread_set_va(). However, instead of setting a new value
* for the string, this will append to the current value.
*/
#define ast_dynamic_str_thread_append_va(buf, max_len, ts, fmt, ap) \
({ \
int __res; \
while ((__res = __ast_dyn_str_helper(buf, max_len, \
ts, 1, fmt, ap)) == AST_DYNSTR_BUILD_RETRY) { \
va_end(ap); \
va_start(ap, fmt); \
} \
(__res); \
})
/*!
* \brief Core functionality of ast_dynamic_str_[thread_](set|append)_va
*
* The arguments to this function are the same as those described for
* ast_dynamic_str_thread_set_va except for an addition argument, append.
* If append is non-zero, this will append to the current string instead of
* writing over it.
*
* In the case that this function is called and the buffer was not large enough
* to hold the result, the partial write will be truncated, and the result
* AST_DYNSTR_BUILD_RETRY will be returned to indicate that the buffer size
* was increased, and the function should be called a second time.
*
* A return of AST_DYNSTR_BUILD_FAILED indicates a memory allocation error.
*
* A return value greater than or equal to zero indicates the number of
* characters that have been written, not including the terminating '\0'.
* In the append case, this only includes the number of characters appended.
*
* \note This function should never need to be called directly. It should
* through calling one of the other functions or macros defined in this
* file.
*/
int __ast_dyn_str_helper(struct ast_dynamic_str **buf, size_t max_len,
struct ast_threadstorage *ts, int append, const char *fmt, va_list ap);
/*!
* \brief Set a thread locally stored dynamic string using variable arguments
*
* \arg buf This is the address of a pointer to an ast_dynamic_str which should
* have been retrieved using ast_dynamic_str_thread_get. It will need to
* be updated in the case that the buffer has to be reallocated to
* accomodate a longer string than what it currently has space for.
* \arg max_len This is the maximum length to allow the string buffer to grow
* to. If this is set to 0, then there is no maximum length.
* \arg ts This is a pointer to the thread storage structure declared by using
* the AST_THREADSTORAGE macro. If declared with
* AST_THREADSTORAGE(my_buf, my_buf_init), then this argument would be
* (&my_buf).
* \arg fmt This is the format string (printf style)
*
* \return The return value of this function is the same as that of the printf
* family of functions.
*
* Example usage:
* \code
* AST_THREADSTORAGE(my_str, my_str_init);
* #define MY_STR_INIT_SIZE 128
* ...
* void my_func(int arg1, int arg2)
* {
* struct ast_dynamic_str *buf;
* va_list ap;
*
* if (!(buf = ast_dynamic_str_thread_get(&my_str, MY_STR_INIT_SIZE)))
* return;
* ...
* ast_dynamic_str_thread_set(&buf, 0, &my_str, "arg1: %d arg2: %d\n",
* arg1, arg2);
*
* printf("This is the string we just built: %s\n", buf->str);
* ...
* }
* \endcode
*/
AST_INLINE_API(
int __attribute__ ((format (printf, 4, 5))) ast_dynamic_str_thread_set(
struct ast_dynamic_str **buf, size_t max_len,
struct ast_threadstorage *ts, const char *fmt, ...),
{
int res;
va_list ap;
va_start(ap, fmt);
res = ast_dynamic_str_thread_set_va(buf, max_len, ts, fmt, ap);
va_end(ap);
return res;
}
)
/*!
* \brief Append to a thread local dynamic string
*
* The arguments, return values, and usage of this function are the same as
* ast_dynamic_str_thread_set(). However, instead of setting a new value for
* the string, this function appends to the current value.
*/
AST_INLINE_API(
int __attribute__ ((format (printf, 4, 5))) ast_dynamic_str_thread_append(
struct ast_dynamic_str **buf, size_t max_len,
struct ast_threadstorage *ts, const char *fmt, ...),
{
int res;
va_list ap;
va_start(ap, fmt);
res = ast_dynamic_str_thread_append_va(buf, max_len, ts, fmt, ap);
va_end(ap);
return res;
}
)
/*!
* \brief Set a dynamic string
*
* \arg buf This is the address of a pointer to an ast_dynamic_str. It will
* need to be updated in the case that the buffer has to be reallocated to
* accommodate a longer string than what it currently has space for.
* \arg max_len This is the maximum length to allow the string buffer to grow
* to. If this is set to 0, then there is no maximum length.
*
* \return The return value of this function is the same as that of the printf
* family of functions.
*/
AST_INLINE_API(
int __attribute__ ((format (printf, 3, 4))) ast_dynamic_str_set(
struct ast_dynamic_str **buf, size_t max_len,
const char *fmt, ...),
{
int res;
va_list ap;
va_start(ap, fmt);
res = ast_dynamic_str_thread_set_va(buf, max_len, NULL, fmt, ap);
va_end(ap);
return res;
}
)
/*!
* \brief Append to a dynamic string
*
* The arguments, return values, and usage of this function are the same as
* ast_dynamic_str_set(). However, this function appends to the string instead
* of setting a new value.
*/
AST_INLINE_API(
int __attribute__ ((format (printf, 3, 4))) ast_dynamic_str_append(
struct ast_dynamic_str **buf, size_t max_len,
const char *fmt, ...),
{
int res;
va_list ap;
va_start(ap, fmt);
res = ast_dynamic_str_thread_append_va(buf, max_len, NULL, fmt, ap);
va_end(ap);
return res;
}
)
#endif /* _ASTERISK_STRINGS_H */

335
include/asterisk/threadstorage.h
View File

@@ -56,14 +56,10 @@
* \brief data for a thread locally stored variable
*/
struct ast_threadstorage {
/*! Ensure that the key is only initialized by one thread */
pthread_once_t once;
/*! The key used to retrieve this thread's data */
pthread_key_t key;
/*! The function that initializes the key */
void (*key_init)(void);
/*! Custom initialization function specific to the object */
int (*custom_init)(void *);
pthread_once_t once; /*!< Ensure that the key is only initialized by one thread */
pthread_key_t key; /*!< The key used to retrieve this thread's data */
void (*key_init)(void); /*!< The function that initializes the key */
int (*custom_init)(void *); /*!< Custom initialization function specific to the object */
};
/*!
@@ -161,327 +157,4 @@ void *ast_threadstorage_get(struct ast_threadstorage *ts, size_t init_size),
void __ast_threadstorage_cleanup(void *);
/*!
* A dynamic length string. This is just a C string prefixed by a length
* field. len reflects the actual space allocated, while the string is
* NUL-terminated as a regular C string.
* One should never declare a variable with this type, but only a pointer
* to it, and use ast_dynamic_str_create() to initialize it.
*/
struct ast_dynamic_str {
size_t len; /*!< The current maximum length of the string */
char str[0]; /*!< The string buffer */
};
/*!
* \brief Create a dynamic length string
*
* \arg init_len This is the initial length of the string buffer
*
* \return This function returns a pointer to the dynamic string length. The
* result will be NULL in the case of a memory allocation error.
*
* \note The result of this function is dynamically allocated memory, and must
* be free()'d after it is no longer needed.
*/
AST_INLINE_API(
struct ast_dynamic_str * attribute_malloc ast_dynamic_str_create(size_t init_len),
{
struct ast_dynamic_str *buf;
if (!(buf = ast_calloc(1, sizeof(*buf) + init_len)))
return NULL;
buf->len = init_len;
return buf;
}
)
/*!
* \brief Retrieve a thread locally stored dynamic string
*
* \arg ts This is a pointer to the thread storage structure declared by using
* the AST_THREADSTORAGE macro. If declared with
* AST_THREADSTORAGE(my_buf, my_buf_init), then this argument would be
* (&my_buf).
* \arg init_len This is the initial length of the thread's dynamic string. The
* current length may be bigger if previous operations in this thread have
* caused it to increase.
*
* \return This function will return the thread locally stored dynamic string
* associated with the thread storage management variable passed as the
* first argument.
* The result will be NULL in the case of a memory allocation error.
*
* Example usage:
* \code
* AST_THREADSTORAGE(my_str, my_str_init);
* #define MY_STR_INIT_SIZE 128
* ...
* void my_func(const char *fmt, ...)
* {
* struct ast_dynamic_str *buf;
*
* if (!(buf = ast_dynamic_str_thread_get(&my_str, MY_STR_INIT_SIZE)))
* return;
* ...
* }
* \endcode
*/
AST_INLINE_API(
struct ast_dynamic_str *ast_dynamic_str_thread_get(struct ast_threadstorage *ts,
size_t init_len),
{
struct ast_dynamic_str *buf;
if (!(buf = ast_threadstorage_get(ts, sizeof(*buf) + init_len)))
return NULL;
if (!buf->len)
buf->len = init_len;
return buf;
}
)
/*!
* \brief Error codes from ast_dynamic_str_thread_build_va()
*/
enum {
/*! An error has occured and the contents of the dynamic string
* are undefined */
AST_DYNSTR_BUILD_FAILED = -1,
/*! The buffer size for the dynamic string had to be increased, and
* ast_dynamic_str_thread_build_va() needs to be called again after
* a va_end() and va_start().
*/
AST_DYNSTR_BUILD_RETRY = -2
};
/*!
* \brief Set a thread locally stored dynamic string from a va_list
*
* \arg buf This is the address of a pointer to an ast_dynamic_str which should
* have been retrieved using ast_dynamic_str_thread_get. It will need to
* be updated in the case that the buffer has to be reallocated to
* accommodate a longer string than what it currently has space for.
* \arg max_len This is the maximum length to allow the string buffer to grow
* to. If this is set to 0, then there is no maximum length.
* \arg ts This is a pointer to the thread storage structure declared by using
* the AST_THREADSTORAGE macro. If declared with
* AST_THREADSTORAGE(my_buf, my_buf_init), then this argument would be
* (&my_buf).
* \arg fmt This is the format string (printf style)
* \arg ap This is the va_list
*
* \return The return value of this function is the same as that of the printf
* family of functions.
*
* Example usage:
* \code
* AST_THREADSTORAGE(my_str, my_str_init);
* #define MY_STR_INIT_SIZE 128
* ...
* void my_func(const char *fmt, ...)
* {
* struct ast_dynamic_str *buf;
* va_list ap;
*
* if (!(buf = ast_dynamic_str_thread_get(&my_str, MY_STR_INIT_SIZE)))
* return;
* ...
* va_start(fmt, ap);
* ast_dynamic_str_thread_set_va(&buf, 0, &my_str, fmt, ap);
* va_end(ap);
*
* printf("This is the string we just built: %s\n", buf->str);
* ...
* }
* \endcode
*/
#define ast_dynamic_str_thread_set_va(buf, max_len, ts, fmt, ap) \
({ \
int __res; \
while ((__res = ast_dynamic_str_thread_build_va(buf, max_len, \
ts, 0, fmt, ap)) == AST_DYNSTR_BUILD_RETRY) { \
va_end(ap); \
va_start(ap, fmt); \
} \
(__res); \
})
/*!
* \brief Append to a thread local dynamic string using a va_list
*
* The arguments, return values, and usage of this are the same as those for
* ast_dynamic_str_thread_set_va(). However, instead of setting a new value
* for the string, this will append to the current value.
*/
#define ast_dynamic_str_thread_append_va(buf, max_len, ts, fmt, ap) \
({ \
int __res; \
while ((__res = ast_dynamic_str_thread_build_va(buf, max_len, \
ts, 1, fmt, ap)) == AST_DYNSTR_BUILD_RETRY) { \
va_end(ap); \
va_start(ap, fmt); \
} \
(__res); \
})
/*!
* \brief Core functionality of ast_dynamic_str_thread_(set|append)_va
*
* The arguments to this function are the same as those described for
* ast_dynamic_str_thread_set_va except for an addition argument, append.
* If append is non-zero, this will append to the current string instead of
* writing over it.
*
* In the case that this function is called and the buffer was not large enough
* to hold the result, the partial write will be truncated, and the result
* AST_DYNSTR_BUILD_RETRY will be returned to indicate that the buffer size
* was increased, and the function should be called a second time.
*
* A return of AST_DYNSTR_BUILD_FAILED indicates a memory allocation error.
*
* A return value greater than or equal to zero indicates the number of
* characters that have been written, not including the terminating '\0'.
* In the append case, this only includes the number of characters appended.
*
* \note This function should never need to be called directly. It should
* through calling one of the other functions or macros defined in this
* file.
*/
int ast_dynamic_str_thread_build_va(struct ast_dynamic_str **buf, size_t max_len,
struct ast_threadstorage *ts, int append, const char *fmt, va_list ap);
/*!
* \brief Set a thread locally stored dynamic string using variable arguments
*
* \arg buf This is the address of a pointer to an ast_dynamic_str which should
* have been retrieved using ast_dynamic_str_thread_get. It will need to
* be updated in the case that the buffer has to be reallocated to
* accomodate a longer string than what it currently has space for.
* \arg max_len This is the maximum length to allow the string buffer to grow
* to. If this is set to 0, then there is no maximum length.
* \arg ts This is a pointer to the thread storage structure declared by using
* the AST_THREADSTORAGE macro. If declared with
* AST_THREADSTORAGE(my_buf, my_buf_init), then this argument would be
* (&my_buf).
* \arg fmt This is the format string (printf style)
*
* \return The return value of this function is the same as that of the printf
* family of functions.
*
* Example usage:
* \code
* AST_THREADSTORAGE(my_str, my_str_init);
* #define MY_STR_INIT_SIZE 128
* ...
* void my_func(int arg1, int arg2)
* {
* struct ast_dynamic_str *buf;
* va_list ap;
*
* if (!(buf = ast_dynamic_str_thread_get(&my_str, MY_STR_INIT_SIZE)))
* return;
* ...
* ast_dynamic_str_thread_set(&buf, 0, &my_str, "arg1: %d arg2: %d\n",
* arg1, arg2);
*
* printf("This is the string we just built: %s\n", buf->str);
* ...
* }
* \endcode
*/
AST_INLINE_API(
int __attribute__ ((format (printf, 4, 5))) ast_dynamic_str_thread_set(
struct ast_dynamic_str **buf, size_t max_len,
struct ast_threadstorage *ts, const char *fmt, ...),
{
int res;
va_list ap;
va_start(ap, fmt);
res = ast_dynamic_str_thread_set_va(buf, max_len, ts, fmt, ap);
va_end(ap);
return res;
}
)
/*!
* \brief Append to a thread local dynamic string
*
* The arguments, return values, and usage of this function are the same as
* ast_dynamic_str_thread_set(). However, instead of setting a new value for
* the string, this function appends to the current value.
*/
AST_INLINE_API(
int __attribute__ ((format (printf, 4, 5))) ast_dynamic_str_thread_append(
struct ast_dynamic_str **buf, size_t max_len,
struct ast_threadstorage *ts, const char *fmt, ...),
{
int res;
va_list ap;
va_start(ap, fmt);
res = ast_dynamic_str_thread_append_va(buf, max_len, ts, fmt, ap);
va_end(ap);
return res;
}
)
/*!
* \brief Set a dynamic string
*
* \arg buf This is the address of a pointer to an ast_dynamic_str. It will
* need to be updated in the case that the buffer has to be reallocated to
* accommodate a longer string than what it currently has space for.
* \arg max_len This is the maximum length to allow the string buffer to grow
* to. If this is set to 0, then there is no maximum length.
*
* \return The return value of this function is the same as that of the printf
* family of functions.
*/
AST_INLINE_API(
int __attribute__ ((format (printf, 3, 4))) ast_dynamic_str_set(
struct ast_dynamic_str **buf, size_t max_len,
const char *fmt, ...),
{
int res;
va_list ap;
va_start(ap, fmt);
res = ast_dynamic_str_thread_set_va(buf, max_len, NULL, fmt, ap);
va_end(ap);
return res;
}
)
/*!
* \brief Append to a dynamic string
*
* The arguments, return values, and usage of this function are the same as
* ast_dynamic_str_set(). However, this function appends to the string instead
* of setting a new value.
*/
AST_INLINE_API(
int __attribute__ ((format (printf, 3, 4))) ast_dynamic_str_append(
struct ast_dynamic_str **buf, size_t max_len,
const char *fmt, ...),
{
int res;
va_list ap;
va_start(ap, fmt);
res = ast_dynamic_str_thread_append_va(buf, max_len, NULL, fmt, ap);
va_end(ap);
return res;
}
)
#endif /* ASTERISK_THREADSTORAGE_H */

3
include/asterisk/utils.h
View File

@@ -32,10 +32,10 @@
#include <arpa/inet.h> /* we want to override inet_ntoa */
#include <netdb.h>
#include <limits.h>
#include <string.h>
#include "asterisk/lock.h"
#include "asterisk/time.h"
#include "asterisk/strings.h"
#include "asterisk/logger.h"
#include "asterisk/compiler.h"
@@ -540,4 +540,5 @@ int _ast_vasprintf(char **ret, const char *file, int lineno, const char *func, c
*/
void ast_enable_packet_fragmentation(int sock);
#include "asterisk/strings.h"
#endif /* _ASTERISK_UTILS_H */

42
main/utils.c
View File

@@ -972,33 +972,47 @@ int ast_get_time_t(const char *src, time_t *dst, time_t _default, int *consumed)
return -1;
}
int ast_dynamic_str_thread_build_va(struct ast_dynamic_str **buf, size_t max_len,
/*!
* core handler for dynamic strings.
* This is not meant to be called directly, but rather through the
* various wrapper macros
* ast_dynamic_str_set(...)
* ast_dynamic_str_append(...)
* ast_dynamic_str_thread_set(...)
* ast_dynamic_str_thread_append(...)
*/
int __ast_dyn_str_helper(struct ast_dynamic_str **buf, size_t max_len,
struct ast_threadstorage *ts, int append, const char *fmt, va_list ap)
{
int res, need;
int offset = (append && (*buf)->len) ? strlen((*buf)->str) : 0;
int offset = (append && (*buf)->len) ? (*buf)->used : 0;
if (max_len < 0)
max_len = (*buf)->len; /* don't exceed the allocated space */
/*
* Ask vsnprintf how much space we need. Remember that vsnprintf
* does not count the final '\0' so we must add 1.
*/
res = vsnprintf((*buf)->str + offset, (*buf)->len - offset, fmt, ap);
need = res + offset + 1;
/* Check to see if there was not enough space in the string buffer to prepare
* the string. Also, if a maximum length is present, make sure the current
* length is less than the maximum before increasing the size. */
/*
* If there is not enough space and we are below the max length,
* reallocate the buffer and return a message telling to retry.
*/
if (need > (*buf)->len && (max_len == 0 || (*buf)->len < max_len) ) {
/* Set the new size of the string buffer to be the size needed
* to hold the resulting string (res) plus one byte for the
* terminating '\0'. If this size is greater than the max, set
* the new length to be the maximum allowed. */
if (max_len && max_len < need)
if (max_len && max_len < need) /* truncate as needed */
need = max_len;
/* We can only realloc malloc'ed space. */
if ((*buf)->type != DS_MALLOC)
return AST_DYNSTR_BUILD_FAILED;
*buf = ast_realloc(*buf, need + sizeof(struct ast_dynamic_str));
if (*buf == NULL)
if (*buf == NULL) /* XXX watch out, we leak memory here */
return AST_DYNSTR_BUILD_FAILED;
(*buf)->len = need;
/* Truncate the partial write. */
(*buf)->str[offset] = '\0';
(*buf)->str[offset] = '\0'; /* Truncate the partial write. */
if (ts)
pthread_setspecific(ts->key, *buf);
@@ -1007,6 +1021,8 @@ int ast_dynamic_str_thread_build_va(struct ast_dynamic_str **buf, size_t max_len
* vsnprintf() again. */
return AST_DYNSTR_BUILD_RETRY;
}
/* update space used, keep in mind the truncation */
(*buf)->used = (res + offset > (*buf)->len) ? (*buf)->len : res + offset;
return res;
}