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sprinter: Add a string_len method

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This method allows callers to output strings with specific lengths.
It's useful both for strings with embedded NULs (which JSON can
represent, though parser support is apparently spotty), and
non-terminated strings.
This commit is contained in:
Austin Clements 2012-08-02 21:14:49 -04:00 committed by David Bremner
parent 624d1897ce
commit 14883b0700
3 changed files with 29 additions and 7 deletions
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16
sprinter-json.c
View file

@ -88,8 +88,13 @@ json_end (struct sprinter *sp)
fputc ('\n', spj->stream);
}
/* This implementation supports embedded NULs as allowed by the JSON
* specification and Unicode. Support for *parsing* embedded NULs
* varies, but is generally not a problem outside of C-based parsers
* (Python's json module and Emacs' json.el take embedded NULs in
* stride). */
static void
json_string (struct sprinter *sp, const char *val)
json_string_len (struct sprinter *sp, const char *val, size_t len)
{
static const char *const escapes[] = {
['\"'] = "\\\"", ['\\'] = "\\\\", ['\b'] = "\\b",
@ -98,7 +103,7 @@ json_string (struct sprinter *sp, const char *val)
struct sprinter_json *spj = json_begin_value (sp);
fputc ('"', spj->stream);
for (; *val; ++val) {
for (; len; ++val, --len) {
unsigned char ch = *val;
if (ch < ARRAY_SIZE (escapes) && escapes[ch])
fputs (escapes[ch], spj->stream);
@ -110,6 +115,12 @@ json_string (struct sprinter *sp, const char *val)
fputc ('"', spj->stream);
}
static void
json_string (struct sprinter *sp, const char *val)
{
json_string_len (sp, val, strlen (val));
}
static void
json_integer (struct sprinter *sp, int val)
{
@ -166,6 +177,7 @@ sprinter_json_create (const void *ctx, FILE *stream)
.begin_list = json_begin_list,
.end = json_end,
.string = json_string,
.string_len = json_string_len,
.integer = json_integer,
.boolean = json_boolean,
.null = json_null,

11
sprinter-text.c
View file

@ -25,14 +25,20 @@ struct sprinter_text {
};
static void
text_string (struct sprinter *sp, const char *val)
text_string_len (struct sprinter *sp, const char *val, size_t len)
{
struct sprinter_text *sptxt = (struct sprinter_text *) sp;
if (sptxt->current_prefix != NULL)
fprintf (sptxt->stream, "%s:", sptxt->current_prefix);
fputs(val, sptxt->stream);
fwrite (val, len, 1, sptxt->stream);
}
static void
text_string (struct sprinter *sp, const char *val)
{
text_string_len (sp, val, strlen (val));
}
static void
@ -105,6 +111,7 @@ sprinter_text_create (const void *ctx, FILE *stream)
.begin_list = text_begin_list,
.end = text_end,
.string = text_string,
.string_len = text_string_len,
.integer = text_integer,
.boolean = text_boolean,
.null = text_null,

9
sprinter.h
View file

@ -23,11 +23,14 @@ typedef struct sprinter {
*/
void (*end) (struct sprinter *);
/* Print one string/integer/boolean/null element (possibly inside a
* list or map, followed or preceded by separators).
* For string, the char * must be UTF-8 encoded.
/* Print one string/integer/boolean/null element (possibly inside
* a list or map, followed or preceded by separators). For string
* and string_len, the char * must be UTF-8 encoded. string_len
* allows non-terminated strings and strings with embedded NULs
* (though the handling of the latter is format-dependent).
*/
void (*string) (struct sprinter *, const char *);
void (*string_len) (struct sprinter *, const char *, size_t);
void (*integer) (struct sprinter *, int);
void (*boolean) (struct sprinter *, notmuch_bool_t);
void (*null) (struct sprinter *);