ref: 2cdc8075f8109b69895bc56bd4d3f59deb6da360
parent: 52a367f3ea8b6fa256b2a9b0e52c5c2d557a9fc3
author: kemal <kemali13@protonmail.com>
date: Mon Apr 19 21:40:31 EDT 2021
file: recognize executable scripts, etc. The patch does the following: 1. Adds recognition of executable script (shebang) files. 2. Returns correct MIME type for mbox files (RFC 4155). 3. Returns XML instead of HTML type in some cases.
--- a/sys/src/cmd/file.c
+++ b/sys/src/cmd/file.c
@@ -169,6 +169,7 @@
int isface(void);
int isexec(void);
int isudiff(void);
+int isexecscript(void);
int p9bitnum(char*, int*);
int p9subfont(uchar*);
void print_utf(void);
@@ -182,6 +183,7 @@
istring, /* recognizable by first string */
iself, /* ELF (foreign) executable */
isexec, /* native executables */
+ isexecscript, /* executable scripts */
iff, /* interchange file format (strings) */
longoff, /* recognizable by 4 bytes at some offset */
isoffstr, /* recognizable by string at some offset */
@@ -722,7 +724,42 @@
return 0;
}
+/* executable scripts */
+int
+isexecscript(void)
+{+ char tmp[128+1], *p;
+
+ if (memcmp("#!", buf, 2) != 0)+ return 0;
+ memmove(tmp, buf+2, sizeof(tmp) - 1);
+ tmp[sizeof(tmp) - 1] = 0;
+ if ((p = strchr(tmp, '\n')) != nil)
+ *p = 0;
+ if ((p = strpbrk(tmp, " \t")) != nil)
+ *p = 0;
+ if ((p = strrchr(tmp, '/')) != nil)
+ p++;
+ else
+ p = tmp;
+ if (strcmp("rc", p) == 0)+ print("%s\n", mime ? PLAIN : "rc executable file");+ else if (strcmp("sh", p) == 0)+ print("%s\n", mime ? "application/x-sh" : "sh executable file");+ else if (strcmp("bash", p) == 0)+ print("%s\n", mime ? "application/x-sh" : "bash executable file");+ else if (strcmp("awk", p) == 0)+ print("%s\n", mime ? PLAIN : "awk executable file");+ else if (strcmp("sed", p) == 0)+ print("%s\n", mime ? PLAIN : "sed executable file");+ else if (strcmp("perl", p) == 0)+ print("%s\n", mime ? PLAIN : "perl executable file");+ else
+ print("%s\n", mime ? PLAIN : "unknown executable file");+ return 1;
+}
+
/* from tar.c */
enum { NAMSIZ = 100, TBLOCK = 512 };@@ -805,8 +842,6 @@
"!<arch>\n__.SYMDEF", "archive random library", 16, OCTET,
"!<arch>\n", "archive", 8, OCTET,
"070707", "cpio archive - ascii header", 6, OCTET,
- "#!/bin/rc", "rc executable file", 9, PLAIN,
- "#!/bin/sh", "sh executable file", 9, PLAIN,
"%!", "postscript", 2, "application/postscript",
"\004%!", "postscript", 3, "application/postscript",
"x T post", "troff output for post", 8, "application/troff",
@@ -820,10 +855,10 @@
"%PDF", "PDF", 4, "application/pdf",
"<!DOCTYPE", "HTML file", 9, "text/html",
"<!doctype", "HTML file", 9, "text/html",
- "<!--", "HTML file", 4, "text/html",
+ "<!--", "XML file", 4, "text/xml",
"<html>", "HTML file", 6, "text/html",
"<HTML>", "HTML file", 6, "text/html",
- "<?xml", "HTML file", 5, "text/html",
+ "<?xml", "XML file", 5, "text/xml",
"\111\111\052\000", "tiff", 4, "image/tiff",
"\115\115\000\052", "tiff", 4, "image/tiff",
"\377\330\377\340", "jpeg", 4, "image/jpeg",
@@ -1108,7 +1143,7 @@
return 0;
*q = 0;
if(strncmp(p, "From ", 5) == 0 && strstr(p, " remote from ") == nil){- print("%s\n", mime ? PLAIN : "mail box");+ print("%s\n", mime ? "application/mbox" : "mail box");return 1;
}
*q = '\n';