swaybar: Replace fgets with read and own buffer
This commit is contained in:
progandy
parent
b66c51ea2c
commit
21541e9e64
221
swaybar/main.c
221
swaybar/main.c
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@ -1,3 +1,4 @@
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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@ -60,9 +61,9 @@ list_t *status_line = NULL;
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list_t *workspaces = NULL;
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int socketfd;
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pid_t pid;
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int pipefd[2];
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FILE *command;
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int status_read_fd;
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char line[1024];
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char line_rest[1024];
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char *output, *status_command;
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struct registry *registry;
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struct window *window;
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@ -110,10 +111,11 @@ struct {
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int bufsize;
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char *buffer;
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char *line_start;
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char *parserpos;
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bool escape;
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int depth;
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int state[I3JSON_MAXDEPTH+1];
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} i3json_state = { 0, NULL, NULL, false, 0, { I3JSON_UNKNOWN } };
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} i3json_state = { 0, NULL, NULL, NULL, false, 0, { I3JSON_UNKNOWN } };
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void swaybar_teardown() {
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@ -122,8 +124,8 @@ void swaybar_teardown() {
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registry_teardown(registry);
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}
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if (command) {
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fclose(command);
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if (status_read_fd) {
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close(status_read_fd);
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}
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if (pid) {
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@ -137,8 +139,8 @@ void swaybar_teardown() {
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}
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}
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if (pipefd[0]) {
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close(pipefd[0]);
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if (status_read_fd) {
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close(status_read_fd);
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}
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}
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@ -607,34 +609,124 @@ void parse_json(const char *text) {
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json_object_put(results);
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}
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int i3json_handle(FILE *file) {
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char *c;
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int handled = 0;
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// handle partially buffered data
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// make sure 1023+1 bytes at the end are free
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if (i3json_state.line_start) {
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int len = strlen(i3json_state.line_start);
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memmove(i3json_state.buffer, i3json_state.line_start, len+1);
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if (i3json_state.bufsize < len+1024) {
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i3json_state.bufsize += 1024;
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i3json_state.buffer = realloc(i3json_state.buffer, i3json_state.bufsize);
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// Read line from file descriptor, only show the line tail if it is too long.
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// In non-blocking mode treat "no more data" as a linebreak.
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// If data after a line break has been read, return it in rest.
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// If rest is non-empty, then use that as the start of the next line.
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int read_line_tail(int fd, char *buf, int nbyte, char *rest) {
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if (fd < 0 || !buf || !nbyte) {
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return -1;
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}
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int l;
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char *buffer = malloc(nbyte*2+1);
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char *readpos = buffer;
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char *lf;
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// prepend old data to new line if necessary
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if (rest) {
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l = strlen(rest);
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if (l > nbyte) {
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strcpy(buffer, rest + l - nbyte);
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readpos += nbyte;
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} else if (l) {
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strcpy(buffer, rest);
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readpos += l;
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}
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c = i3json_state.buffer+len;
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i3json_state.line_start = i3json_state.buffer;
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} else if (!i3json_state.buffer) {
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i3json_state.buffer = malloc(1024);
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i3json_state.bufsize = 1024;
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c = i3json_state.buffer;
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}
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// read until a linefeed is found or no more data is available
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while ((l = read(fd, readpos, nbyte)) > 0) {
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readpos[l] = '\0';
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lf = strchr(readpos, '\n');
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if (lf) {
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// linefeed found, replace with \0
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*lf = '\0';
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// give data from the end of the line, try to fill the buffer
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if (lf-buffer > nbyte) {
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strcpy(buf, lf - nbyte + 1);
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} else {
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strcpy(buf, buffer);
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}
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// we may have read data from the next line, save it to rest
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if (rest) {
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rest[0] = '\0';
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strcpy(rest, lf + 1);
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}
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free(buffer);
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return strlen(buf);
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} else {
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// no linefeed found, slide data back.
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int overflow = readpos - buffer + l - nbyte;
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if (overflow > 0) {
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memmove(buffer, buffer + overflow , nbyte + 1);
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}
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}
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}
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if (l < 0) {
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free(buffer);
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return l;
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}
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readpos[l]='\0';
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if (rest) {
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rest[0] = '\0';
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}
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if (nbyte < readpos - buffer + l - 1) {
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memcpy(buf, readpos - nbyte + l + 1, nbyte);
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} else {
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c = i3json_state.buffer;
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strncpy(buf, buffer, nbyte);
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}
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buf[nbyte-1] = '\0';
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free(buffer);
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return strlen(buf);
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}
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// make sure that enough buffer space is available starting from parserpos
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void i3json_ensure_free(int min_free) {
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int _step = 10240;
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int r = min_free % _step;
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if (r) {
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min_free += _step - r;
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}
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if (!i3json_state.buffer) {
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i3json_state.buffer = malloc(min_free);
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i3json_state.bufsize = min_free;
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i3json_state.parserpos = i3json_state.buffer;
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} else {
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int len = 0;
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int pos = 0;
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if (i3json_state.line_start) {
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len = strlen(i3json_state.line_start);
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pos = i3json_state.parserpos - i3json_state.line_start;
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if (i3json_state.line_start != i3json_state.buffer) {
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memmove(i3json_state.buffer, i3json_state.line_start, len+1);
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}
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} else {
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len = strlen(i3json_state.buffer);
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}
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if (i3json_state.bufsize < len+min_free) {
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i3json_state.bufsize += min_free;
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if (i3json_state.bufsize > 1024000) {
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sway_abort("Status line json too long or malformed.");
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}
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i3json_state.buffer = realloc(i3json_state.buffer, i3json_state.bufsize);
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if (!i3json_state.buffer) {
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sway_abort("Could not allocate json buffer");
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}
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}
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if (i3json_state.line_start) {
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i3json_state.line_start = i3json_state.buffer;
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i3json_state.parserpos = i3json_state.buffer + pos;
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} else {
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i3json_state.parserpos = i3json_state.buffer;
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}
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}
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if (!i3json_state.buffer) {
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sway_abort("Could not allocate buffer.");
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}
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// get fresh data at the end of the buffer
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if (!fgets(c, 1023, file)) return -1;
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c[1023] = '\0';
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}
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// continue parsing from last parserpos
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int i3json_parse() {
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char *c = i3json_state.parserpos;
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int handled = 0;
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while (*c) {
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if (i3json_state.state[i3json_state.depth] == I3JSON_STRING) {
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if (!i3json_state.escape && *c == '"') {
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@ -679,9 +771,30 @@ int i3json_handle(FILE *file) {
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}
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++c;
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}
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i3json_state.parserpos = c;
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return handled;
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}
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// append data and parse it.
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int i3json_handle_data(char *data) {
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int len = strlen(data);
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i3json_ensure_free(len);
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strcpy(i3json_state.parserpos, data);
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return i3json_parse();
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}
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// read data from fd and parse it.
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int i3json_handle_fd(int fd) {
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i3json_ensure_free(10240);
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// get fresh data at the end of the buffer
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int readlen = read(fd, i3json_state.parserpos, 10239);
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if (readlen < 0) {
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return readlen;
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}
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i3json_state.parserpos[readlen] = '\0';
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return i3json_parse();
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}
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void poll_for_update() {
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fd_set readfds;
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int activity;
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@ -698,7 +811,7 @@ void poll_for_update() {
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dirty = false;
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FD_ZERO(&readfds);
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FD_SET(socketfd, &readfds);
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FD_SET(pipefd[0], &readfds);
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FD_SET(status_read_fd, &readfds);
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activity = select(FD_SETSIZE, &readfds, NULL, NULL, NULL);
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if (activity < 0) {
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@ -714,41 +827,40 @@ void poll_for_update() {
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dirty = true;
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}
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if (status_command && FD_ISSET(pipefd[0], &readfds)) {
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if (status_command && FD_ISSET(status_read_fd, &readfds)) {
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sway_log(L_DEBUG, "Got update from status command.");
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int linelen;
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switch (protocol) {
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case I3BAR:
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sway_log(L_DEBUG, "Got i3bar protocol.");
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if (i3json_handle(command) > 0) {
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if (i3json_handle_fd(status_read_fd) > 0) {
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dirty = true;
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}
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break;
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case TEXT:
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case UNDEF:
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sway_log(L_DEBUG, "Got text protocol.");
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fgets(line, sizeof(line), command);
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linelen = strlen(line) - 1;
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if (line[linelen] == '\n') {
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line[linelen] = '\0';
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read_line_tail(status_read_fd, line, sizeof(line), line_rest);
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dirty = true;
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break;
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case UNDEF:
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sway_log(L_DEBUG, "Detecting protocol...");
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if (read_line_tail(status_read_fd, line, sizeof(line), line_rest) < 0) {
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break;
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}
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dirty = true;
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if (protocol == UNDEF) {
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protocol = TEXT;
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if (line[0] == '{') {
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// detect i3bar json protocol
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json_object *proto = json_tokener_parse(line);
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json_object *version;
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if (proto) {
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if (json_object_object_get_ex(proto, "version", &version)
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&& json_object_get_int(version) == 1
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) {
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sway_log(L_DEBUG, "Switched to i3bar protocol.");
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protocol = I3BAR;
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line[0] = '\0';
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}
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json_object_put(proto);
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protocol = TEXT;
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if (line[0] == '{') {
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// detect i3bar json protocol
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json_object *proto = json_tokener_parse(line);
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json_object *version;
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if (proto) {
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if (json_object_object_get_ex(proto, "version", &version)
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&& json_object_get_int(version) == 1
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) {
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sway_log(L_DEBUG, "Switched to i3bar protocol.");
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protocol = I3BAR;
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i3json_handle_data(line_rest);
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}
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json_object_put(proto);
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}
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}
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break;
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@ -831,6 +943,7 @@ int main(int argc, char **argv) {
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bar_ipc_init(desired_output, bar_id);
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if (status_command) {
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int pipefd[2];
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pipe(pipefd);
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pid = fork();
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if (pid == 0) {
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@ -848,8 +961,8 @@ int main(int argc, char **argv) {
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}
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close(pipefd[1]);
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command = fdopen(pipefd[0], "r");
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setbuf(command, NULL);
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status_read_fd = pipefd[0];
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fcntl(status_read_fd, F_SETFL, O_NONBLOCK);
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line[0] = '\0';
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}
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