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Properly print arbitrary strings as valid JSON. #1362

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15 changes: 15 additions & 0 deletions src/helpers.c
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Original file line number Diff line number Diff line change
Expand Up @@ -193,3 +193,18 @@ bool is_hex_color(const char *color)
}
return true;
}

void print_string_as_json(FILE *f, char *str)
{
fputc('"', f);
for (char *ptr = str; *ptr != '\0'; ++ptr) {
if (*ptr == '\x7f' || (*ptr >= '\x01' && *ptr <= '\x1f')) {
fprintf(f, "\\u%04x", *ptr);
continue;
}
if (*ptr == '"' || *ptr == '\\')
fputc('\\', f);
fputc(*ptr, f);
}
fputc('"', f);
}
1 change: 1 addition & 0 deletions src/helpers.h
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Expand Up @@ -83,5 +83,6 @@ char *mktempfifo(const char *template);
int asprintf(char **buf, const char *fmt, ...);
int vasprintf(char **buf, const char *fmt, va_list args);
bool is_hex_color(const char *color);
void print_string_as_json(FILE *f, char *str);

#endif
28 changes: 19 additions & 9 deletions src/query.c
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Expand Up @@ -27,13 +27,14 @@
#include <string.h>
#include "bspwm.h"
#include "desktop.h"
#include "geometry.h"
#include "helpers.h"
#include "history.h"
#include "parse.h"
#include "monitor.h"
#include "window.h"
#include "tree.h"
#include "parse.h"
#include "query.h"
#include "geometry.h"
#include "tree.h"
#include "window.h"

void query_state(FILE *rsp)
{
Expand Down Expand Up @@ -69,7 +70,9 @@ void query_state(FILE *rsp)
void query_monitor(monitor_t *m, FILE *rsp)
{
fprintf(rsp, "{");
fprintf(rsp, "\"name\":\"%s\",", m->name);
fprintf(rsp, "\"name\":");
print_string_as_json(rsp, m->name);
fprintf(rsp, ",");
fprintf(rsp, "\"id\":%u,", m->id);
fprintf(rsp, "\"randrId\":%u,", m->randr_id);
fprintf(rsp, "\"wired\":%s,", BOOL_STR(m->wired));
Expand Down Expand Up @@ -98,7 +101,9 @@ void query_monitor(monitor_t *m, FILE *rsp)
void query_desktop(desktop_t *d, FILE *rsp)
{
fprintf(rsp, "{");
fprintf(rsp, "\"name\":\"%s\",", d->name);
fprintf(rsp, "\"name\":");
print_string_as_json(rsp, d->name);
fprintf(rsp, ",");
fprintf(rsp, "\"id\":%u,", d->id);
fprintf(rsp, "\"layout\":\"%s\",", LAYOUT_STR(d->layout));
fprintf(rsp, "\"userLayout\":\"%s\",", LAYOUT_STR(d->user_layout));
Expand Down Expand Up @@ -164,8 +169,12 @@ void query_client(client_t *c, FILE *rsp)
fprintf(rsp, "null");
} else {
fprintf(rsp, "{");
fprintf(rsp, "\"className\":\"%s\",", c->class_name);
fprintf(rsp, "\"instanceName\":\"%s\",", c->instance_name);
fprintf(rsp, "\"className\":");
print_string_as_json(rsp, c->class_name);
fprintf(rsp, ",");
fprintf(rsp, "\"instanceName\":");
print_string_as_json(rsp, c->instance_name);
fprintf(rsp, ",");
fprintf(rsp, "\"borderWidth\":%u,", c->border_width);
fprintf(rsp, "\"state\":\"%s\",", STATE_STR(c->state));
fprintf(rsp, "\"lastState\":\"%s\",", STATE_STR(c->last_state));
Expand Down Expand Up @@ -232,7 +241,8 @@ void query_subscribers(FILE *rsp)
for (subscriber_list_t *s = subscribe_head; s != NULL; s = s->next) {
fprintf(rsp, "{\"fileDescriptor\": %i", fileno(s->stream));
if (s->fifo_path != NULL) {
fprintf(rsp, ",\"fifoPath\":\"%s\"", s->fifo_path);
fprintf(rsp, ",\"fifoPath\":");
print_string_as_json(rsp, s->fifo_path);
}
fprintf(rsp, ",\"field\":%i,\"count\":%i}", s->field, s->count);
if (s->next != NULL) {
Expand Down