mirror of
https://github.com/alsa-project/alsa-utils
synced 2024-12-31 15:59:45 +01:00
alsaucm: add json dump command
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela
parent
860ffda825
commit
49716fa61e
2 changed files with 249 additions and 4 deletions
251
alsaucm/dump.c
251
alsaucm/dump.c
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@ -32,10 +32,14 @@ struct renderer {
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const char *verb,
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const char *comment);
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int (*verb_end)(struct renderer *r);
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int (*device_block_begin)(struct renderer *r);
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int (*device_block_end)(struct renderer *r);
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int (*device_begin)(struct renderer *r,
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const char *device,
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const char *comment);
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int (*device_end)(struct renderer *r);
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int (*modifier_block_begin)(struct renderer *r);
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int (*modifier_block_end)(struct renderer *r);
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int (*modifier_begin)(struct renderer *r,
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const char *device,
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const char *comment);
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@ -52,6 +56,10 @@ struct renderer {
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void *opaque;
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};
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/*
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* Text renderer
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*/
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struct text {
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char a[1];
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};
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@ -177,12 +185,12 @@ static int text_con_start(struct renderer *r)
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static int text_value_begin(struct renderer *r)
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{
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return text_2nd_level(r, "Values [\n");
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return text_2nd_level(r, "Values {\n");
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}
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static int text_value_end(struct renderer *r)
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{
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return text_2nd_level(r, "]\n");
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return text_2nd_level(r, "}\n");
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}
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static int text_value(struct renderer *r, const char *ident, const char *value)
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@ -217,6 +225,220 @@ static struct renderer text_renderer = {
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.value = text_value,
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};
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/*
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* JSON renderer
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*/
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struct json {
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int block[5];
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};
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static char *jesc(const char *s, char *buf, size_t buf_len)
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{
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char *dst = buf;
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char c = '"';
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*dst++ = c;
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buf_len--;
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while (*s && buf_len > 2) {
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if (*s == '\"') {
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if (buf_len > 3) {
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*dst++ = '"';
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*dst++ = *s++;
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buf_len -= 2;
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continue;
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} else {
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break;
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}
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}
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*dst++ = *s++;
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}
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*dst++ = c;
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*dst = '\0';
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return buf;
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}
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#define JESC(s, esc) jesc((s), (esc), sizeof(esc))
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static void json_block(struct renderer *r, int level, int last)
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{
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struct json *j = r->opaque;
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printf((j->block[level] && !last) ? ",\n" : "\n");
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j->block[level] = last ? 0 : 1;
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}
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static int json_init(struct renderer *r)
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{
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printf("{\n \"Verbs\": {");
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return 0;
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}
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static void json_done(struct renderer *r)
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{
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json_block(r, 0, 1);
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printf(" }\n}\n");
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}
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static int json_verb_start(struct renderer *r, const char *verb, const char *comment)
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{
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char buf[256];
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json_block(r, 0, 0);
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printf(" %s: {", JESC(verb, buf));
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if (comment && comment[0]) {
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json_block(r, 1, 0);
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printf(" \"Comment\": %s", JESC(comment, buf));
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}
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return 0;
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}
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static int json_verb_end(struct renderer *r)
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{
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json_block(r, 1, 1);
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printf(" }");
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return 0;
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}
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static int json_2nd_level_block_end(struct renderer *r)
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{
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json_block(r, 2, 1);
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printf(" }");
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return 0;
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}
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static int json_2nd_level_begin(struct renderer *r,
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const char *val,
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const char *comment)
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{
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char buf[256];
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json_block(r, 2, 0);
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printf(" %s: {", JESC(val, buf));
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if (comment && comment[0]) {
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json_block(r, 3, 0);
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printf(" \"Comment\": %s", JESC(comment, buf));
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}
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return 0;
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}
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static int json_2nd_level_end(struct renderer *r)
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{
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json_block(r, 3, 1);
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printf(" }");
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return 0;
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}
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static int json_2nd_level(struct renderer *r, const char *txt)
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{
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printf(" %s", txt);
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return 0;
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}
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static int json_3rd_level(struct renderer *r, const char *txt)
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{
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printf(" %s", txt);
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return 0;
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}
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static int json_dev_block_start(struct renderer *r)
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{
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json_block(r, 1, 0);
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printf(" \"Devices\": {");
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return 0;
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}
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static int json_mod_block_start(struct renderer *r)
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{
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json_block(r, 1, 0);
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printf(" \"Modifiers\": {");
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return 0;
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}
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static int json_supcon_start(struct renderer *r, const char *key)
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{
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json_block(r, 3, 0);
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if (json_2nd_level(r, key))
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return 1;
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printf(": [");
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return 0;
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}
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static int json_supcon_value(struct renderer *r, const char *value, int last)
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{
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char buf[256];
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JESC(value, buf);
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json_block(r, 4, 0);
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return json_3rd_level(r, buf);
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}
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static int json_supcon_end(struct renderer *r)
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{
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json_block(r, 4, 1);
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return json_2nd_level(r, "]");
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}
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static int json_sup_start(struct renderer *r)
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{
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return json_supcon_start(r, "\"SupportedDevices\"");
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}
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static int json_con_start(struct renderer *r)
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{
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return json_supcon_start(r, "\"ConflictingDevices\"");
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}
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static int json_value_begin(struct renderer *r)
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{
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json_block(r, 3, 0);
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return json_2nd_level(r, "\"Values\": {");
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}
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static int json_value_end(struct renderer *r)
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{
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json_block(r, 4, 1);
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return json_2nd_level(r, "}");
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}
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static int json_value(struct renderer *r, const char *ident, const char *value)
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{
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char buf[256];
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int err;
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json_block(r, 4, 0);
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JESC(ident, buf);
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err = json_3rd_level(r, buf);
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if (err < 0)
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return err;
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JESC(value, buf);
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printf(": %s", buf);
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return 0;
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}
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static struct renderer json_renderer = {
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.init = json_init,
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.done = json_done,
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.verb_begin = json_verb_start,
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.verb_end = json_verb_end,
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.device_block_begin = json_dev_block_start,
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.device_block_end = json_2nd_level_block_end,
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.device_begin = json_2nd_level_begin,
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.device_end = json_2nd_level_end,
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.modifier_block_begin = json_mod_block_start,
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.modifier_block_end = json_2nd_level_block_end,
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.modifier_begin = json_2nd_level_begin,
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.modifier_end = json_2nd_level_end,
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.supported_begin = json_sup_start,
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.supported_value = json_supcon_value,
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.supported_end = json_supcon_end,
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.conflict_begin = json_con_start,
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.conflict_value = json_supcon_value,
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.conflict_end = json_supcon_end,
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.value_begin = json_value_begin,
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.value_end = json_value_end,
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.value = json_value,
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};
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/*
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* universal dump functions
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*/
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static int render_devlist(struct context *context,
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struct renderer *render,
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const char *verb,
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@ -350,6 +572,12 @@ static void render(struct context *context, struct renderer *render)
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context->command, verb);
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continue;
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}
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if (dev_num == 0)
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goto __mods;
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if (render->device_block_begin && render->device_block_begin(render)) {
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snd_use_case_free_list(dev_list, dev_num);
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goto __end;
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}
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for (j = 0; j < dev_num; j += 2) {
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render->device_begin(render, dev_list[j + 0], dev_list[j + 1]);
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if (render_device(context, render, verb, dev_list[j + 0])) {
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@ -359,6 +587,9 @@ static void render(struct context *context, struct renderer *render)
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render->device_end(render);
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}
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snd_use_case_free_list(dev_list, dev_num);
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if (render->device_block_end && render->device_block_end(render))
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goto __end;
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__mods:
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/* modifiers */
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snprintf(buf, sizeof(buf), "_modifiers/%s", verb);
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dev_num = snd_use_case_get_list(uc_mgr, buf, &dev_list);
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@ -367,11 +598,20 @@ static void render(struct context *context, struct renderer *render)
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context->command, verb);
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continue;
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}
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if (dev_num == 0)
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goto __verb_end;
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if (render->modifier_block_begin && render->modifier_block_begin(render)) {
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snd_use_case_free_list(dev_list, dev_num);
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goto __end;
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}
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for (j = 0; j < dev_num; j += 2) {
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render->modifier_begin(render, dev_list[j + 0], dev_list[j + 1]);
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render->modifier_end(render);
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}
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snd_use_case_free_list(dev_list, dev_num);
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if (render->modifier_block_end && render->modifier_block_end(render))
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goto __end;
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__verb_end:
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/* end */
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if (render->verb_end(render))
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break;
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@ -385,14 +625,19 @@ __end:
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void dump(struct context *context, const char *format)
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{
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struct renderer r;
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struct text t;
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struct json j;
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r.opaque = NULL;
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if (strcasecmp(format, "text") == 0 ||
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strcasecmp(format, "txt") == 0) {
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struct text t;
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memset(&t, 0, sizeof(t));
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r = text_renderer;
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r.opaque = &t;
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} else if (strcasecmp(format, "json") == 0) {
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memset(&j, 0, sizeof(j));
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r = json_renderer;
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r.opaque = &j;
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}
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if (r.opaque != NULL) {
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render(context, &r);
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@ -108,7 +108,7 @@ static void dump_help(struct context *context)
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" reset reset sound card to default state\n"
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" reload reload configuration\n"
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" listcards list available cards\n"
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" dump FORMAT dump all config information (format: text)\n"
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" dump FORMAT dump all config information (format: text,json)\n"
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" list IDENTIFIER list command, for items with value + comment\n"
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" list1 IDENTIFIER list command, for items without comments\n"
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" get IDENTIFIER get string value\n"
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