Make improvements

- Fix build flakes
- Polyfill SIGWINCH on Windows
- Fix an execve issue on Windows
- Make strerror show more information
- Improve cmd.exe setup/teardown on Windows
- Support bracketed paste mode in Blinkenlights
- Show keyboard shortcuts in Blinkenlights status bar
- Fixed copy_file_range() and copyfile() w/ zip filesystem
- Size optimize GetDosArgv() to keep life.com 12kb in size
- Improve Blinkenlights ability to load weird ELF executables
- Fix program_executable_name and add GetInterpreterExecutableName
- Make Python in tiny mode fail better if docstrings are requested
- Update Python test exclusions in tiny* modes such as tinylinux
- Add bulletproof unbreakable kprintf() troubleshooting function
- Remove "oldskool" keyword from ape.S for virus scanners
- Fix issue that caused backtraces to not print sometimes
- Improve Blinkenlights serial uart character i/o
- Make clock_gettime() not clobber errno on xnu
- Improve sha256 cpuid check for old computers
- Integrate some bestline linenoise fixes
- Show runit process names better in htop
- Remove SIGPIPE from ShowCrashReports()
- Make realpath() not clobber errno
- Avoid attaching GDB on non-Linux
- Improve img.com example

examples/img.c

@@ -7,23 +7,97 @@
 │   • http://creativecommons.org/publicdomain/zero/1.0/            │
 ╚─────────────────────────────────────────────────────────────────*/
 #endif
+#include "libc/log/log.h"
+#include "libc/runtime/gc.internal.h"
 #include "libc/stdio/stdio.h"
 #include "libc/x/x.h"
+#include "net/http/escape.h"
+#include "net/http/http.h"
+#include "third_party/getopt/getopt.h"
 #include "third_party/stb/stb_image.h"
 
-/**
- * @fileoverview Utility for printing HTML <img> tags.
- */
+#define USAGE \
+  " [FLAGS] IMG...\n\
+Utility for printing HTML <img> tags.\n\
+\n\
+FLAGS\n\
+\n\
+  -h      Help\n\
+  -a      Wrap with <a> tag\n\
+  -u      Embed data:base64 URI\n"
+
+int scale;
+bool linktag;
+bool datauri;
+bool sizeonly;
+
+void PrintUsage(int rc, FILE *f) {
+  fputs("Usage: ", f);
+  fputs(program_invocation_name, f);
+  fputs(USAGE, f);
+  exit(rc);
+}
+
+void PrintImg(const char *path) {
+  size_t n;
+  int opt, i, yn, xn, cn, w, h;
+  void *img, *pix, *src, *mime;
+  if (!(img = gc(xslurp(path, &n)))) exit(2);
+  if (!(pix = gc(stbi_load_from_memory(img, n, &xn, &yn, &cn, 0)))) exit(3);
+  if (linktag) {
+    printf("<a href=\"%s\"\n  >", path);
+  }
+  src = path;
+  if (datauri) {
+    src = xasprintf("data:%s;base64,%s", FindContentType(path, -1),
+                    gc(EncodeBase64(img, n, &n)));
+  }
+  w = (xn + (1 << scale) / 2) >> scale;
+  h = (yn + (1 << scale) / 2) >> scale;
+  if (sizeonly) {
+    printf("width=\"%d\" height=\"%d\"", w, h);
+  } else {
+    printf("<img width=\"%d\" height=\"%d\" alt=\"[%s]\"\n     src=\"%s\">", w,
+           h, path, src);
+  }
+  if (linktag) {
+    printf("</a>");
+  }
+  printf("\n");
+}
 
 int main(int argc, char *argv[]) {
-  void *p;
-  size_t n;
-  int yn, xn, cn;
-  if (argc != 2) return 1;
-  if (!(p = xslurp(argv[1], &n))) return 2;
-  if (!(p = stbi_load_from_memory(p, n, &xn, &yn, &cn, 0))) return 3;
-  printf("<img src=\"%s\" width=\"%d\" height=\"%d\"\n"
-         "     alt=\"[%s]\">\n",
-         argv[1], (xn + 1) >> 1, (yn + 1) >> 1, argv[1]);
-  return 0;
+  showcrashreports();
+  int i;
+  while ((i = getopt(argc, argv, "?huas01234")) != -1) {
+    switch (i) {
+      case '0':
+      case '1':
+      case '2':
+      case '3':
+      case '4':
+        scale = i - '0';
+        break;
+      case 's':
+        sizeonly = true;
+        break;
+      case 'a':
+        linktag = true;
+        break;
+      case 'u':
+        datauri = true;
+        break;
+      case '?':
+      case 'h':
+        PrintUsage(0, stdout);
+      default:
+        PrintUsage(1, stderr);
+    }
+  }
+  if (optind == argc) {
+    PrintUsage(1, stderr);
+  }
+  for (i = optind; i < argc; ++i) {
+    PrintImg(argv[i]);
+  }
 }