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MEDIUM: args: use #define to specify the number of bits used by arg types and counts

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This is in order to add new types. This patch does not change anything
else. Two remaining (harmless) occurrences of a count of 8 instead of 7
were fixed by this patch : empty_arg_list[] and the for() loop counting
args.
This commit is contained in:
Willy Tarreau 2015-01-19 18:44:07 +01:00
parent 8560328211
commit 3d241e78a1
3 changed files with 32 additions and 23 deletions
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18
include/proto/arg.h
View File

@ -31,33 +31,33 @@
* the number of mandatory arguments in a mask.
*/
#define ARGM(m) \
(m & 15)
(m & ARGM_MASK)
#define ARG1(m, t1) \
(ARGM(m) + (ARGT_##t1 << 4))
(ARGM(m) + (ARGT_##t1 << (ARGM_BITS)))
#define ARG2(m, t1, t2) \
(ARG1(m, t1) + (ARGT_##t2 << 8))
(ARG1(m, t1) + (ARGT_##t2 << (ARGM_BITS + ARGT_BITS)))
#define ARG3(m, t1, t2, t3) \
(ARG2(m, t1, t2) + (ARGT_##t3 << 12))
(ARG2(m, t1, t2) + (ARGT_##t3 << (ARGM_BITS + ARGT_BITS * 2)))
#define ARG4(m, t1, t2, t3, t4) \
(ARG3(m, t1, t2, t3) + (ARGT_##t4 << 16))
(ARG3(m, t1, t2, t3) + (ARGT_##t4 << (ARGM_BITS + ARGT_BITS * 3)))
#define ARG5(m, t1, t2, t3, t4, t5) \
(ARG4(m, t1, t2, t3, t4) + (ARGT_##t5 << 20))
(ARG4(m, t1, t2, t3, t4) + (ARGT_##t5 << (ARGM_BITS + ARGT_BITS * 4)))
#define ARG6(m, t1, t2, t3, t4, t5, t6) \
(ARG5(m, t1, t2, t3, t4, t5) + (ARGT_##t6 << 24))
(ARG5(m, t1, t2, t3, t4, t5) + (ARGT_##t6 << (ARGM_BITS + ARGT_BITS * 5)))
#define ARG7(m, t1, t2, t3, t4, t5, t6, t7) \
(ARG6(m, t1, t2, t3, t4, t5, t6) + (ARGT_##t7 << 28))
(ARG6(m, t1, t2, t3, t4, t5, t6) + (ARGT_##t7 << (ARGM_BITS + ARGT_BITS * 6)))
/* This dummy arg list may be used by default when no arg is found, it helps
* parsers by removing pointer checks.
*/
extern struct arg empty_arg_list[8];
extern struct arg empty_arg_list[ARGM_NBARGS];
struct arg_list *arg_list_clone(const struct arg_list *orig);
struct arg_list *arg_list_add(struct arg_list *orig, struct arg *arg, int pos);

11
include/types/arg.h
View File

@ -28,6 +28,16 @@
#include <common/chunk.h>
#include <common/mini-clist.h>
/* encoding of each arg type */
#define ARGT_BITS 4
#define ARGT_NBTYPES (1 << ARGT_BITS)
#define ARGT_MASK (ARGT_NBTYPES - 1)
/* encoding of the arg count */
#define ARGM_MASK ((1 << ARGM_BITS) - 1)
#define ARGM_BITS 4
#define ARGM_NBARGS (32 - ARGM_BITS) / sizeof(int)
enum {
ARGT_STOP = 0, /* end of the arg list */
ARGT_UINT, /* unsigned integer, which is a positive integer without any sign */
@ -45,7 +55,6 @@ enum {
ARGT_SRV, /* a pointer to a server */
ARGT_USR, /* a pointer to a user list */
ARGT_MAP, /* a pointer to a map descriptor */
ARGT_NBTYPES /* no more values past 15 */
};
/* context where arguments are used, in order to help error reporting */

26
src/arg.c
View File

@ -40,7 +40,7 @@ static const char *arg_type_names[ARGT_NBTYPES] = {
/* This dummy arg list may be used by default when no arg is found, it helps
* parsers by removing pointer checks.
*/
struct arg empty_arg_list[8] = { };
struct arg empty_arg_list[ARGM_NBARGS] = { };
/* This function clones a struct arg_list template into a new one which is
* returned.
@ -86,9 +86,9 @@ struct arg_list *arg_list_add(struct arg_list *orig, struct arg *arg, int pos)
* type ARGT_STOP (0), unless the mask indicates that no argument is supported.
* Unresolved arguments are appended to arg list <al>, which also serves as a
* template to create new entries. The mask is composed of a number of
* mandatory arguments in its lower 4 bits, and a concatenation of each
* argument type in each subsequent 4-bit block. If <err_msg> is not NULL, it
* must point to a freeable or NULL pointer.
* mandatory arguments in its lower ARGM_BITS bits, and a concatenation of each
* argument type in each subsequent ARGT_BITS-bit sblock. If <err_msg> is not
* NULL, it must point to a freeable or NULL pointer.
*/
int make_arg_list(const char *in, int len, unsigned int mask, struct arg **argp,
char **err_msg, const char **err_ptr, int *err_arg,
@ -104,12 +104,12 @@ int make_arg_list(const char *in, int len, unsigned int mask, struct arg **argp,
*argp = NULL;
min_arg = mask & 15;
mask >>= 4;
min_arg = mask & ARGM_MASK;
mask >>= ARGM_BITS;
pos = 0;
/* find between 0 and 8 the max number of args supported by the mask */
for (nbarg = 0; nbarg < 8 && ((mask >> (nbarg * 4)) & 0xF); nbarg++);
/* find between 0 and NBARGS the max number of args supported by the mask */
for (nbarg = 0; nbarg < ARGM_NBARGS && ((mask >> (nbarg * ARGT_BITS)) & ARGT_MASK); nbarg++);
if (!nbarg)
goto end_parse;
@ -138,7 +138,7 @@ int make_arg_list(const char *in, int len, unsigned int mask, struct arg **argp,
free(word);
word = my_strndup(beg, in - beg);
arg->type = (mask >> (pos * 4)) & 15;
arg->type = (mask >> (pos * ARGT_BITS)) & ARGT_MASK;
switch (arg->type) {
case ARGT_SINT:
@ -265,7 +265,7 @@ int make_arg_list(const char *in, int len, unsigned int mask, struct arg **argp,
/* not enough arguments */
memprintf(err_msg,
"missing arguments (got %d/%d), type '%s' expected",
pos, min_arg, arg_type_names[(mask >> (pos * 4)) & 15]);
pos, min_arg, arg_type_names[(mask >> (pos * ARGT_BITS)) & ARGT_MASK]);
goto err;
}
@ -303,16 +303,16 @@ int make_arg_list(const char *in, int len, unsigned int mask, struct arg **argp,
empty_err:
memprintf(err_msg, "expected type '%s' at position %d, but got nothing",
arg_type_names[(mask >> (pos * 4)) & 15], pos + 1);
arg_type_names[(mask >> (pos * ARGT_BITS)) & ARGT_MASK], pos + 1);
goto err;
parse_err:
memprintf(err_msg, "failed to parse '%s' as type '%s' at position %d",
word, arg_type_names[(mask >> (pos * 4)) & 15], pos + 1);
word, arg_type_names[(mask >> (pos * ARGT_BITS)) & ARGT_MASK], pos + 1);
goto err;
not_impl:
memprintf(err_msg, "parsing for type '%s' was not implemented, please report this bug",
arg_type_names[(mask >> (pos * 4)) & 15]);
arg_type_names[(mask >> (pos * ARGT_BITS)) & ARGT_MASK]);
goto err;
}