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json_pointer: add json_pointer_getf/setf() function variants

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These include support for printf() style args for path.

Adds support for calling with 'json_pointer_getf(obj, &res, "/foo/%d/%s", 0, bar)'
style args.

Makes it easier for doing more dynamic stuff/magic, without
needing to use vasprintf() externally.

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>
This commit is contained in:
Alexandru Ardelean
2016-11-16 11:55:41 +02:00
parent 97dd7d5103
commit 742e059da1
2 changed files with 131 additions and 0 deletions
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85
json_pointer.c
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@@ -8,6 +8,7 @@
#include "config.h"
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
@@ -192,6 +193,37 @@ int json_pointer_get(struct json_object *obj, const char *path, struct json_obje
return rc;
}
int json_pointer_getf(struct json_object *obj, struct json_object **res, const char *path_fmt, ...)
{
char *path_copy = NULL;
int rc = 0;
va_list args;
if (!obj || !path_fmt) {
errno = EINVAL;
return -1;
}
va_start(args, path_fmt);
rc = vasprintf(&path_copy, path_fmt, args);
va_end(args);
if (rc < 0)
return rc;
if (path_copy[0] == '\0') {
if (res)
*res = obj;
goto out;
}
rc = json_pointer_get_recursive(obj, path_copy, res);
out:
free(path_copy);
return rc;
}
int json_pointer_set(struct json_object **obj, const char *path, struct json_object *value)
{
const char *endp;
@@ -237,3 +269,56 @@ int json_pointer_set(struct json_object **obj, const char *path, struct json_obj
return json_pointer_set_single_path(set, endp, value);
}
int json_pointer_setf(struct json_object **obj, struct json_object *value, const char *path_fmt, ...)
{
char *endp;
char *path_copy = NULL;
struct json_object *set = NULL;
va_list args;
int rc = 0;
if (!obj || !path_fmt) {
errno = EINVAL;
return -1;
}
/* pass a working copy to the recursive call */
va_start(args, path_fmt);
rc = vasprintf(&path_copy, path_fmt, args);
va_end(args);
if (rc < 0)
return rc;
if (path_copy[0] == '\0') {
json_object_put(*obj);
*obj = value;
goto out;
}
if (path_copy[0] != '/') {
errno = EINVAL;
rc = -1;
goto out;
}
/* If there's only 1 level to set, stop here */
if ((endp = strrchr(path_copy, '/')) == path_copy) {
set = *obj;
goto set_single_path;
}
*endp = '\0';
rc = json_pointer_get_recursive(*obj, path_copy, &set);
if (rc)
goto out;
set_single_path:
endp++;
rc = json_pointer_set_single_path(set, endp, value);
out:
free(path_copy);
return rc;
}