198 lines
7.2 KiB

#ifndef _BUFFER_H_
#define _BUFFER_H_
# include "config.h"
#include "settings.h"
#include <stdlib.h>
#include <sys/types.h>
#include <stdio.h>
#include <time.h>
#if defined HAVE_STDINT_H
# include <stdint.h>
#elif defined HAVE_INTTYPES_H
# include <inttypes.h>
/* generic string + binary data container; contains a terminating 0 in both
* cases
* used == 0 indicates a special "empty" state (unset config values); ptr
* might be NULL too then. otherwise an empty string has used == 1 (and ptr[0]
* == 0);
* copy/append functions will ensure used >= 1 (i.e. never leave it in the
* special empty state); only buffer_copy_buffer will copy the special empty
* state.
typedef struct {
char *ptr;
/* "used" includes a terminating 0 */
size_t used;
/* size of allocated buffer at *ptr */
size_t size;
} buffer;
/* create new buffer; either empty or copy given data */
buffer* buffer_init(void);
buffer* buffer_init_buffer(const buffer *src); /* src can be NULL */
buffer* buffer_init_string(const char *str); /* str can be NULL */
void buffer_free(buffer *b); /* b can be NULL */
/* truncates to used == 0; frees large buffers, might keep smaller ones for reuse */
void buffer_reset(buffer *b); /* b can be NULL */
/* reset b. if NULL != b && NULL != src, move src content to b. reset src. */
void buffer_move(buffer *b, buffer *src);
/* make sure buffer is large enough to store a string of given size
* and a terminating zero.
* sets b to an empty string, and may drop old content.
* @return b->ptr
char* buffer_string_prepare_copy(buffer *b, size_t size);
/* allocate buffer large enough to be able to append a string of given size
* if b was empty (used == 0) it will contain an empty string (used == 1)
* afterwards
* "used" data is preserved; if not empty buffer must contain a
* zero terminated string.
char* buffer_string_prepare_append(buffer *b, size_t size);
/* use after prepare_(copy,append) when you have written data to the buffer
* to increase the buffer length by size. also sets the terminating zero.
* requires enough space is present for the terminating zero (prepare with the
* same size to be sure).
void buffer_commit(buffer *b, size_t size);
/* sets string length:
* - always stores a terminating zero to terminate the "new" string
* - does not modify the string data apart from terminating zero
* - reallocates the buffer iff needed
void buffer_string_set_length(buffer *b, size_t len);
void buffer_copy_string(buffer *b, const char *s);
void buffer_copy_string_len(buffer *b, const char *s, size_t s_len);
void buffer_copy_buffer(buffer *b, const buffer *src);
/* convert input to hex and store in buffer */
void buffer_copy_string_hex(buffer *b, const char *in, size_t in_len);
void buffer_append_string(buffer *b, const char *s);
void buffer_append_string_len(buffer *b, const char *s, size_t s_len);
void buffer_append_string_buffer(buffer *b, const buffer *src);
void buffer_append_uint_hex(buffer *b, uintmax_t len);
void buffer_append_int(buffer *b, intmax_t val);
void buffer_copy_int(buffer *b, intmax_t val);
void buffer_append_strftime(buffer *b, const char *format, const struct tm *tm);
/* '-', log_10 (2^bits) = bits * log 2 / log 10 < bits * 0.31, terminating 0 */
#define LI_ITOSTRING_LENGTH (2 + (8 * sizeof(intmax_t) * 31 + 99) / 100)
void li_itostrn(char *buf, size_t buf_len, intmax_t val);
void li_itostr(char *buf, intmax_t val); /* buf must have at least LI_ITOSTRING_LENGTH bytes */
void li_utostrn(char *buf, size_t buf_len, uintmax_t val);
void li_utostr(char *buf, uintmax_t val); /* buf must have at least LI_ITOSTRING_LENGTH bytes */
/* buf must be (at least) 2*s_len + 1 big. uses lower-case hex letters. */
void li_tohex(char *buf, const char *s, size_t s_len);
char * buffer_search_string_len(buffer *b, const char *needle, size_t len);
/* NULL buffer or empty buffer (used == 0);
* unset "string" (buffer) config options are initialized to used == 0,
* while setting an empty string leads to used == 1
int buffer_is_empty(const buffer *b);
/* NULL buffer, empty buffer (used == 0) or empty string (used == 1) */
int buffer_string_is_empty(const buffer *b);
int buffer_is_equal(const buffer *a, const buffer *b);
int buffer_is_equal_right_len(const buffer *a, const buffer *b, size_t len);
int buffer_is_equal_string(const buffer *a, const char *s, size_t b_len);
int buffer_is_equal_caseless_string(const buffer *a, const char *s, size_t b_len);
int buffer_caseless_compare(const char *a, size_t a_len, const char *b, size_t b_len);
typedef enum {
ENCODING_REL_URI, /* for coding a rel-uri (/with space/and%percent) nicely as part of a href */
ENCODING_REL_URI_PART, /* same as ENC_REL_URL plus coding / too as %2F */
ENCODING_HTML, /* & becomes &amp; and so on */
ENCODING_MINIMAL_XML, /* minimal encoding for xml */
ENCODING_HEX, /* encode string as hex */
ENCODING_HTTP_HEADER /* encode \n with \t\n */
} buffer_encoding_t;
void buffer_append_string_encoded(buffer *b, const char *s, size_t s_len, buffer_encoding_t encoding);
/* escape non-printable characters; simple escapes for \t, \r, \n; fallback to \xCC */
void buffer_append_string_c_escaped(buffer *b, const char *s, size_t s_len);
/* to upper case, replace non alpha-numerics with '_'; if is_http_header prefix with "HTTP_" unless s is "content-type" */
void buffer_copy_string_encoded_cgi_varnames(buffer *b, const char *s, size_t s_len, int is_http_header);
void buffer_urldecode_path(buffer *url);
void buffer_urldecode_query(buffer *url);
void buffer_path_simplify(buffer *dest, buffer *src);
void buffer_to_lower(buffer *b);
void buffer_to_upper(buffer *b);
/** deprecated */
char hex2int(unsigned char c);
char int2hex(char i);
int light_isdigit(int c);
int light_isxdigit(int c);
int light_isalpha(int c);
int light_isalnum(int c);
static inline size_t buffer_string_length(const buffer *b); /* buffer string length without terminating 0 */
static inline size_t buffer_string_space(const buffer *b); /* maximum length of string that can be stored without reallocating */
static inline void buffer_append_slash(buffer *b); /* append '/' no non-empty strings not ending in '/' */
buffer_append_string_len(x, y, sizeof(y) - 1)
buffer_copy_string_len(x, y, sizeof(y) - 1)
#define CONST_STR_LEN(x) x, (x) ? sizeof(x) - 1 : 0
#define CONST_BUF_LEN(x) ((x) ? (x)->ptr : NULL), buffer_string_length(x)
#define UNUSED(x) ( (void)(x) )
void print_backtrace(FILE *file);
void log_failed_assert(const char *filename, unsigned int line, const char *msg) LI_NORETURN;
#define force_assert(x) do { if (!(x)) log_failed_assert(__FILE__, __LINE__, "assertion failed: " #x); } while(0)
#define SEGFAULT() log_failed_assert(__FILE__, __LINE__, "aborted");
/* inline implementations */
static inline size_t buffer_string_length(const buffer *b) {
return NULL != b && 0 != b->used ? b->used - 1 : 0;
static inline size_t buffer_string_space(const buffer *b) {
if (NULL == b || b->size == 0) return 0;
if (0 == b->used) return b->size - 1;
return b->size - b->used;
static inline void buffer_append_slash(buffer *b) {
size_t len = buffer_string_length(b);
if (len > 0 && '/' != b->ptr[len-1]) BUFFER_APPEND_STRING_CONST(b, "/");