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-rw-r--r--src/main.c193
1 files changed, 144 insertions, 49 deletions
diff --git a/src/main.c b/src/main.c
index ea55e6d..a66c6a6 100644
--- a/src/main.c
+++ b/src/main.c
@@ -10,6 +10,7 @@
#include <errno.h>
#include <getopt.h>
#include <stdio.h>
+#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
@@ -22,15 +23,17 @@ void on_alarm(int ignored)
timed_out = true;
}
+__attribute__((noreturn))
void syntax(void)
{
fprintf(stderr,
"Syntax:\n"
- " qlprint [-p lp] -i\n"
- " [-p lp] [-m margin] [-a] [-C|-D] [-W width] [-L length] [-Q] [-n num] [-t threshold] [-x timeout] png...\n"
+ " qlprint [-p lp] [-j] -i\n"
+ " [-p lp] [-j] [-m margin] [-a] [-C|-D] [-W width] [-L length] [-Q] [-n num] [-t threshold] [-x timeout] png...\n"
"Where:\n"
" -p lp Printer port (default /dev/usb/lp0)\n"
" -i Print status information only, then exit\n"
+ " -j Switch to JSON output\n"
" -m margin Margin (dots)\n"
" -a Enable auto-cut\n"
" -C Request continuous-length-tape when printing (error if not)\n"
@@ -46,6 +49,100 @@ void syntax(void)
exit(EXIT_FAILURE);
}
+struct ql_json_context {
+ const char *printer;
+ const char *image;
+ bool output_json;
+};
+
+const char *ql_json_escape(const char *src)
+{
+ static char buf[100];
+ char escape_ch;
+ int i = 0;
+ int n = sizeof(buf) - 3;
+
+ for (; *src; ++src) {
+ if (i > n)
+ break;
+ escape_ch = '\0';
+ switch (*src) {
+ case '\t':
+ escape_ch = 't';
+ break;
+ case '\n':
+ escape_ch = 'n';
+ break;
+ case '\r':
+ escape_ch = 'r';
+ break;
+ case '\f':
+ escape_ch = 'f';
+ break;
+ case '\b':
+ escape_ch = 'b';
+ break;
+ case '\\':
+ escape_ch = '\\';
+ break;
+ case '"':
+ escape_ch = '"';
+ break;
+ default:
+ break;
+ }
+ if (escape_ch != '\0') {
+ buf[i] = '\\';
+ buf[i + 1] = escape_ch;
+ i += 2;
+ } else {
+ buf[i++] = *src;
+ }
+ }
+ buf[i] = '\0';
+ return buf;
+}
+
+__attribute__((noreturn))
+void bail_out(ql_print_json_t *json_ctx, const char *fmt, ...)
+{
+ va_list ap;
+ char *msg = NULL;
+ int ret;
+ int errno_in = errno;
+
+ va_start(ap, fmt);
+ ret = vasprintf(&msg, fmt, ap);
+ va_end(ap);
+
+ if (ret == -1) {
+ perror("vasprintf");
+ exit(EXIT_FAILURE);
+ }
+
+ if (json_ctx->output_json) {
+ printf("{\n");
+ printf("\t\"message\": \"%s\",\n", ql_json_escape(msg));
+ if (json_ctx->printer)
+ printf("\t\"printer\": \"%s\",\n", ql_json_escape(json_ctx->printer));
+ if (json_ctx->image)
+ printf("\t\"image\": \"%s\",\n", ql_json_escape(json_ctx->image));
+ if (errno_in != 0) {
+ printf("\t\"errno\": %d,\n", errno_in);
+ printf("\t\"errstr\": \"%s\",\n", ql_json_escape(strerror(errno_in)));
+ }
+ printf("\t\"status\": \"error\"\n");
+ printf("}\n");
+ } else {
+ if (errno_in != 0)
+ fprintf(stderr, "%s: %s\n", msg, strerror(errno_in));
+ else
+ fprintf(stderr, "%s\n", msg);
+
+ }
+ exit(EXIT_FAILURE);
+}
+
int main(int argc, char *argv[])
{
bool info_only = false;
@@ -56,14 +153,20 @@ int main(int argc, char *argv[])
.threshold = 0x80,
.flags = 0
};
+ ql_print_json_t json_ctx = {
+ .output_json = false,
+ };
const char *printer = "/dev/usb/lp0";
unsigned timeout = 5;
int opt;
- while ((opt = getopt(argc, argv, "ip:m:an:CDW:L:Qx:")) != -1) {
+ while ((opt = getopt(argc, argv, "ijp:m:an:CDW:L:Qx:")) != -1) {
switch (opt) {
case 'i':
info_only = true;
break;
+ case 'j':
+ json_ctx.output_json = true;
+ break;
case 'p':
printer = optarg;
break;
@@ -106,28 +209,20 @@ int main(int argc, char *argv[])
if (optind >= argc && !info_only)
syntax();
+ json_ctx.printer = printer;
ql_ctx_t ctx = ql_open(printer);
- if (!ctx) {
- fprintf(stderr, "Unable to open '%s': %s\n", printer, strerror(errno));
- return EXIT_FAILURE;
- }
+ if (!ctx)
+ bail_out(&json_ctx, "Unable to open printer '%s'", printer);
- if (!ql_init(ctx)) {
- fprintf(stderr, "Failed to send initialisation sequence to printer: %s\n",
- strerror(errno));
- return EXIT_FAILURE;
- }
+ if (!ql_init(ctx))
+ bail_out(&json_ctx, "Failed to send initialisation sequence to printer");
- if (!ql_request_status(ctx)) {
- fprintf(stderr, "Failed to request status from printer: %s\n", strerror(errno));
- return EXIT_FAILURE;
- }
+ if (!ql_request_status(ctx))
+ bail_out(&json_ctx, "Failed to request status from printer");
ql_status_t status = { 0, };
- if (!ql_read_status(ctx, &status)) {
- fprintf(stderr, "Failed to read status from printer: %s\n", strerror(errno));
- return EXIT_FAILURE;
- }
+ if (!ql_read_status(ctx, &status))
+ bail_out(&json_ctx, "Failed to read status from printer");
/*
for (int i = 0; i < 32; ++i)
@@ -136,35 +231,33 @@ printf("\n");
*/
if (info_only) {
- ql_decode_print_status(stdout, &status,
+ ql_decode_print_status(stdout, &status, &json_ctx,
QL_DECODE_MODEL | QL_DECODE_MEDIA | QL_DECODE_ERROR |
QL_DECODE_MODE);
return EXIT_SUCCESS;
}
- if (margin >= 0 && !ql_set_margin(ctx, (uint16_t) margin)) {
- fprintf(stderr, "Failed to set margin: %s\n", strerror(errno));
- return EXIT_FAILURE;
- }
+ if (margin >= 0 && !ql_set_margin(ctx, (uint16_t) margin))
+ bail_out(&json_ctx, "Failed to set margin");
+
if (autocut && (!ql_set_mode(ctx, QL_MODE_AUTOCUT)
- || !ql_set_autocut_every_n(ctx, argc - optind))) {
- fprintf(stderr, "Failed to set autocut: %s\n", strerror(errno));
- return EXIT_FAILURE;
- }
+ || !ql_set_autocut_every_n(ctx, argc - optind)))
+ bail_out(&json_ctx, "Failed to set autocut");
- if (ql_needs_mode_switch(&status) && !ql_switch_to_raster_mode(ctx)) {
- fprintf(stderr, "Failed to set raster mode: %s\n", strerror(errno));
- return EXIT_FAILURE;
- }
+ if (ql_needs_mode_switch(&status) && !ql_switch_to_raster_mode(ctx))
+ bail_out(&json_ctx, "Failed to set raster mode");
signal(SIGALRM, on_alarm);
while (num--) {
cfg.first_page = true;
for (int i = optind; i < argc; ++i) {
- ql_raster_image_t *img = loadpng(argv[i]);
+ const char *img_name = argv[i];
+
+ json_ctx.image = img_name;
+ ql_raster_image_t *img = loadpng(img_name);
if (!img) {
- fprintf(stderr, "Failed to load image '%s'\n", argv[i]);
- return EXIT_FAILURE;
+ errno = 0;
+ bail_out(&json_ctx, "Failed to load image '%s'", img_name);
}
/*
for(int i = 0; i < img->height; ++i)
@@ -174,11 +267,11 @@ for(int i = 0; i < img->height; ++i)
printf("\n");
}
*/
- if (!ql_print_raster_image(ctx, &status, img, &cfg)) {
- fprintf(stderr, "Failed to print '%s' (%ux%u)\n", argv[i],
- img->width, img->height);
- return EXIT_FAILURE;
- }
+ if (!ql_print_raster_image(ctx, &status, img, &cfg))
+ bail_out(&json_ctx,
+ "Failed to print '%s' (%ux%u)",
+ img_name, img->width, img->height);
+
alarm(timeout);
do {
if (!ql_read_status(ctx, &status)) {
@@ -187,18 +280,17 @@ for(int i = 0; i < img->height; ++i)
usleep(5000);
continue;
}
- fprintf(stderr, "Printer stopped responding!\n");
- return EXIT_FAILURE;
- }
- if (status.err_info_1 || status.err_info_2) {
- fprintf(stderr, "Printer reported error(s): %s\n",
- ql_decode_errors(&status));
- return EXIT_FAILURE;
+ bail_out(&json_ctx, "Printer stopped responding!");
}
+ if (status.err_info_1 || status.err_info_2)
+ bail_out(&json_ctx,
+ "Printer reported error(s): %s",
+ ql_decode_errors(&status));
} while (status.status_type != QL_STATUS_TYPE_PRINTING_DONE);
alarm(0);
- printf("%s (%ux%u) OK\n", argv[i], img->width, img->height);
+ if (!json_ctx.output_json)
+ printf("%s (%ux%u) OK\n", argv[i], img->width, img->height);
free(img);
cfg.first_page = false;
@@ -207,5 +299,8 @@ for(int i = 0; i < img->height; ++i)
ql_close(ctx);
+ if (json_ctx.output_json)
+ printf("{\"status\": \"ok\"}\n");
+
return EXIT_SUCCESS;
}
generated by cgit v1.2.1 (git 2.18.0) at 2025-12-26 07:46:09 +0000