Fix path for root case

In case of root, res->path returns '.' which does not mix well with
concatenating the entry name. For example this may result in `.bin` for a folder
`bin` in root.

.clang-format

@@ -0,0 +1,137 @@
+---
+Language:        Cpp
+# BasedOnStyle:  Mozilla
+AccessModifierOffset: -2
+AlignAfterOpenBracket: Align
+AlignConsecutiveMacros: false
+AlignConsecutiveAssignments: false
+AlignConsecutiveDeclarations: false
+AlignEscapedNewlines: Right
+AlignOperands:   true
+AlignTrailingComments: true
+AllowAllArgumentsOnNextLine: true
+AllowAllConstructorInitializersOnNextLine: true
+AllowAllParametersOfDeclarationOnNextLine: false
+AllowShortBlocksOnASingleLine: Never
+AllowShortCaseLabelsOnASingleLine: false
+AllowShortFunctionsOnASingleLine: Inline
+AllowShortLambdasOnASingleLine: All
+AllowShortIfStatementsOnASingleLine: Never
+AllowShortLoopsOnASingleLine: false
+AlwaysBreakAfterDefinitionReturnType: TopLevel
+AlwaysBreakAfterReturnType: TopLevel
+AlwaysBreakBeforeMultilineStrings: false
+AlwaysBreakTemplateDeclarations: Yes
+BinPackArguments: false
+BinPackParameters: false
+BraceWrapping:
+  AfterCaseLabel:  false
+  AfterClass:      true
+  AfterControlStatement: false
+  AfterEnum:       true
+  AfterFunction:   true
+  AfterNamespace:  false
+  AfterObjCDeclaration: false
+  AfterStruct:     true
+  AfterUnion:      true
+  AfterExternBlock: true
+  BeforeCatch:     false
+  BeforeElse:      false
+  IndentBraces:    false
+  SplitEmptyFunction: true
+  SplitEmptyRecord: false
+  SplitEmptyNamespace: true
+BreakBeforeBinaryOperators: None
+BreakBeforeBraces: Mozilla
+BreakBeforeInheritanceComma: false
+BreakInheritanceList: BeforeComma
+BreakBeforeTernaryOperators: true
+BreakConstructorInitializersBeforeComma: false
+BreakConstructorInitializers: BeforeComma
+BreakAfterJavaFieldAnnotations: false
+BreakStringLiterals: true
+ColumnLimit:     80
+CommentPragmas:  '^ IWYU pragma:'
+CompactNamespaces: false
+ConstructorInitializerAllOnOneLineOrOnePerLine: false
+ConstructorInitializerIndentWidth: 2
+ContinuationIndentWidth: 2
+Cpp11BracedListStyle: false
+DeriveLineEnding: true
+DerivePointerAlignment: false
+DisableFormat:   false
+ExperimentalAutoDetectBinPacking: false
+FixNamespaceComments: false
+ForEachMacros:
+  - foreach
+  - Q_FOREACH
+  - BOOST_FOREACH
+IncludeBlocks:   Preserve
+IncludeCategories:
+  - Regex:           '^"(llvm|llvm-c|clang|clang-c)/'
+    Priority:        2
+    SortPriority:    0
+  - Regex:           '^(<|"(gtest|gmock|isl|json)/)'
+    Priority:        3
+    SortPriority:    0
+  - Regex:           '.*'
+    Priority:        1
+    SortPriority:    0
+IncludeIsMainRegex: '(Test)?$'
+IncludeIsMainSourceRegex: ''
+IndentCaseLabels: true
+IndentGotoLabels: true
+IndentPPDirectives: None
+IndentWidth:     2
+IndentWrappedFunctionNames: false
+JavaScriptQuotes: Leave
+JavaScriptWrapImports: true
+KeepEmptyLinesAtTheStartOfBlocks: true
+MacroBlockBegin: ''
+MacroBlockEnd:   ''
+MaxEmptyLinesToKeep: 1
+NamespaceIndentation: None
+ObjCBinPackProtocolList: Auto
+ObjCBlockIndentWidth: 2
+ObjCSpaceAfterProperty: true
+ObjCSpaceBeforeProtocolList: false
+PenaltyBreakAssignment: 2
+PenaltyBreakBeforeFirstCallParameter: 19
+PenaltyBreakComment: 300
+PenaltyBreakFirstLessLess: 120
+PenaltyBreakString: 1000
+PenaltyBreakTemplateDeclaration: 10
+PenaltyExcessCharacter: 1000000
+PenaltyReturnTypeOnItsOwnLine: 200
+PointerAlignment: Left
+ReflowComments:  true
+SortIncludes:    true
+SortUsingDeclarations: true
+SpaceAfterCStyleCast: false
+SpaceAfterLogicalNot: false
+SpaceAfterTemplateKeyword: false
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeCpp11BracedList: false
+SpaceBeforeCtorInitializerColon: true
+SpaceBeforeInheritanceColon: true
+SpaceBeforeParens: ControlStatements
+SpaceBeforeRangeBasedForLoopColon: true
+SpaceInEmptyBlock: false
+SpaceInEmptyParentheses: false
+SpacesBeforeTrailingComments: 1
+SpacesInAngles:  false
+SpacesInConditionalStatement: false
+SpacesInContainerLiterals: true
+SpacesInCStyleCastParentheses: false
+SpacesInParentheses: false
+SpacesInSquareBrackets: false
+SpaceBeforeSquareBrackets: false
+Standard:        Latest
+StatementMacros:
+  - Q_UNUSED
+  - QT_REQUIRE_VERSION
+TabWidth:        8
+UseCRLF:         false
+UseTab:          Never
+...
+

.drone.yml

@@ -7,18 +7,16 @@ steps:
   image: gcc
   commands:
     - make
+    - mv quark quark-dirl
 
-- name: run
-  image: debian
-  commands:
-    - cp quark /usr/local/bin
-    - useradd web && su web && cd
-    - mkdir -p web && cd web && echo "hello from quark" > index.html 
-    - quark -p 9130 -h run -l -u web -g web
-  detach: true
-
-- name: test
-  image: curlimages/curl
-  commands:
-    - sleep 15
-    - curl http://run:9130
+- name: publish
+  image: appleboy/drone-scp
+  settings:
+    host: friedl.net
+    username:
+      from_secret: deploy_user
+    password:
+      from_secret: deploy_password
+    port: 22
+    target: /var/services/dirlist/repo/bin/suckless/quark
+    source: quark-dirl

.gitignore

@@ -0,0 +1,4 @@
+*.o
+.gdb_history
+config.h
+quark

Makefile

@@ -4,11 +4,12 @@
 
 include config.mk
 
-COMPONENTS = data http sock util
+COMPONENTS = data http sock util dirl
 
 all: quark
 
-data.o: data.c data.h util.h http.h config.mk
+data.o: data.c data.h util.h http.h dirl.h config.mk
+dirl.o: dirl.c dirl.h util.h http.h config.mk
 http.o: http.c http.h util.h http.h data.h config.h config.mk
 main.o: main.c util.h sock.h http.h arg.h config.h config.mk
 sock.o: sock.c sock.h util.h config.mk

README.md

@@ -5,20 +5,94 @@ found at https://git.suckless.org/quark.
 
 Quark is a small http server.
 
-# Issues
+# DIRL
 
-## fork: Resource temporarily unavailable
-When running [quark](http://tools.suckless.org/quark/) (#6606994) on my system
-with `sudo ./quark -p 9763 -u <user> -g <group>` it dies with `./quark: fork:
-Resource temporarily unavailable` at `fork()`.
+dirl is a quark extension for customized directory listings.
 
-Reason being that by default quark sets the RLIMIT_NPROC to 512 processes. When running as a non-exclusive user this limit is easily reached before even starting quark.
+Per default dirl generates html for a directory listing like this:
 
-`resource-depletion-fix` contains a small forkbomb (`minibomb.c`) to simulate a user with > 512 processes. Compile it with `make minibomb`. When running the minibomb and quark with the same user quark fails.
+```html
+<!DOCTYPE HTML PUBLIC " - // W3C//DTD HTML 3.2 Final//EN">
+<!-- Header Section -->
+<html>
+  <head>
+    <link rel="stylesheet" href="style.css">
+    <title>Index of {uri}</title>
+  </head>
+  <body>
+    <h1>Index of {uri}</h1>
+    <p><a href="..">&crarr; Parent Directory</a></p>
+    <hr />
+    <table>
+      <tr><th>Name</th><th>Modified</th><th>Size</th></tr>
+<!-- /Header Section -->
 
-The `resource-depletion-fix` branch contains a fix by setting the RLIMIT_NPROC only if the current system limit is lower than what would be set by quark. You can [download the patch](https://dirlist.friedl.net/suckless/quark/), or compile from the `resource-depletion-fix` branch.
+<!-- Entry Section -->
+<!-- (repeated for each entry in the directory) -->
+      <tr>
+        <td><a href="{entry}">{entry}{suffix}</a>
+        <td>{modified}</td>
+        <td>{size}</td>
+      </tr>
+<!-- /Entry Section -->
 
-Note that quark also has a `-n` parameter with which the max number of processes can be set as an alternative to this patch.
+<!-- Footer Section -->
+    </table>
+    <hr />
+    <p>
+      Served by <a href="http://tools.suckless.org/quark/">quark</a> and <a href="https://git.friedl.net/playground/suckless-quark/src/branch/dirlist">dirl</a>
+    </p>
+</body>
+</html>
+<!-- /Footer Section -->
+```
+
+## Customize
+
+The default listing can be styled by a `style.css` in the root directory.
+
+You can also use your fully customized template by creating one or all the
+template files for each section. Per default the section templates are named:
+- .header.tpl
+- .entry.tpl (repeated for each directory entry)
+- .footer.tpl
+
+Note that if you only provide some of the template files, they have to be
+compatible with the generated default for the other sections.
+
+For each of these templates you can use placeholders that are replaced by their respective values:
+- header
+    * `{uri}`: Replaced by the current path
+- entry
+    * `{entry}`: Name of the entry
+    * `{suffix}`: A suffix for the entry, mostly useful to distinguish directories (suffix '/') from files
+    * `{modified}`: Date the entry was last modified
+    * `{size}`: Size of the entry (if available)
+    
+### Subdirectory styling
+
+dirl tries to the closest template for the currently visited path. This gives
+you the opportunity to override templates in subdirectories. dirl walks the
+directory hierarchy upwards from the currently visited path. As soon as it finds
+one of the template files in a directory, it stops searching and uses the
+templates in that directory.
+
+In case no templates are found up until and including root, the default
+templates are used.
+
+### Customize names
+
+The files defined as templates and style are ignored in the directory listing
+itself. In case you need to list one of these directories, or have any other
+reason to choose different names, the filenames can be configured in `dirl.h`.
+Note that you need to compile your own quark version then.
+
+# Download
+You can also download CI builds for [quark-dirl](https://dirlist.friedl.net/bin/suckless/quark/). 
+
+There are no official releases. Quark has no dependencies and you can easily
+build it from source. Don't forget to read up on the [suckless
+philosophy](http://suckless.org/philosophy/).
 
 # Github Users
 If you are visiting this repository on GitHub, you are on a mirror of

data.c

@@ -10,6 +10,7 @@
 #include "http.h"
 #include "data.h"
 #include "util.h"
+#include "dirl.h"
 
 static int
 compareent(const struct dirent **d1, const struct dirent **d2)
@@ -25,64 +26,6 @@ compareent(const struct dirent **d1, const struct dirent **d2)
 	return strcmp((*d1)->d_name, (*d2)->d_name);
 }
 
-static char *
-suffix(int t)
-{
-	switch (t) {
-	case DT_FIFO: return "|";
-	case DT_DIR:  return "/";
-	case DT_LNK:  return "@";
-	case DT_SOCK: return "=";
-	}
-
-	return "";
-}
-
-static void
-html_escape(const char *src, char *dst, size_t dst_siz)
-{
-	const struct {
-		char c;
-		char *s;
-	} escape[] = {
-		{ '&',  "&"  },
-		{ '<',  "&lt;"   },
-		{ '>',  "&gt;"   },
-		{ '"',  "&quot;" },
-		{ '\'', "&#x27;" },
-	};
-	size_t i, j, k, esclen;
-
-	for (i = 0, j = 0; src[i] != '\0'; i++) {
-		for (k = 0; k < LEN(escape); k++) {
-			if (src[i] == escape[k].c) {
-				break;
-			}
-		}
-		if (k == LEN(escape)) {
-			/* no escape char at src[i] */
-			if (j == dst_siz - 1) {
-				/* silent truncation */
-				break;
-			} else {
-				dst[j++] = src[i];
-			}
-		} else {
-			/* escape char at src[i] */
-			esclen = strlen(escape[k].s);
-
-			if (j >= dst_siz - esclen) {
-				/* silent truncation */
-				break;
-			} else {
-				memcpy(&dst[j], escape[k].s, esclen);
-				j += esclen;
-			}
-		}
-	}
-	dst[j] = '\0';
-}
-
 enum status
 data_send_dirlisting(int fd, const struct response *res)
 {
@@ -90,48 +33,38 @@ data_send_dirlisting(int fd, const struct response *res)
 	struct dirent **e;
 	size_t i;
 	int dirlen;
-	char esc[PATH_MAX /* > NAME_MAX */ * 6]; /* strlen("&...;") <= 6 */
 
 	/* read directory */
 	if ((dirlen = scandir(res->path, &e, NULL, compareent)) < 0) {
 		return S_FORBIDDEN;
 	}
 
-	/* listing header (we use esc because sizeof(esc) >= PATH_MAX) */
-	html_escape(res->uri, esc, MIN(PATH_MAX, sizeof(esc)));
-	if (dprintf(fd,
-	            "<!DOCTYPE html>\n<html>\n\t<head>"
-	            "<title>Index of %s</title></head>\n"
-	            "\t<body>\n\t\t<a href=\"..\">..</a>",
-	            esc) < 0) {
-		ret = S_REQUEST_TIMEOUT;
-		goto cleanup;
-	}
+  /* read templates */
+  struct dirl_templ templates = dirl_read_templ(res->uri);
 
-	/* listing */
+  /* listing header */
+  if ((ret = dirl_header(fd, res, &templates))) {
+    return ret;
+  }
+
+	/* entries */
 	for (i = 0; i < (size_t)dirlen; i++) {
-		/* skip hidden files, "." and ".." */
-		if (e[i]->d_name[0] == '.') {
-			continue;
-		}
+    /*  skip dirl special files */
+    if(dirl_skip(e[i]->d_name)) {
+      continue;
+    }
+
+    /* entry line */
+    if ((ret = dirl_entry(fd, e[i], res, &templates))) {
+      goto cleanup;
+    }
 
-		/* entry line */
-		html_escape(e[i]->d_name, esc, sizeof(esc));
-		if (dprintf(fd, "<br />\n\t\t<a href=\"%s%s\">%s%s</a>",
-		            esc,
-		            (e[i]->d_type == DT_DIR) ? "/" : "",
-		            esc,
-		            suffix(e[i]->d_type)) < 0) {
-			ret = S_REQUEST_TIMEOUT;
-			goto cleanup;
-		}
 	}
 
-	/* listing footer */
-	if (dprintf(fd, "\n\t</body>\n</html>\n") < 0) {
-		ret = S_REQUEST_TIMEOUT;
-		goto cleanup;
-	}
+  /* listing footer */
+  if ((ret = dirl_footer(fd, &templates))) {
+    goto cleanup;
+  }
 
 cleanup:
 	while (dirlen--) {

dirl.c

@@ -0,0 +1,250 @@
+/* See LICENSE file for copyright and license details. */
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <linux/limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/sendfile.h>
+#include <sys/stat.h>
+#include <time.h>
+#include <unistd.h>
+
+#include "config.h"
+#include "dirl.h"
+#include "http.h"
+#include "util.h"
+
+static char*
+suffix(int t)
+{
+  switch (t) {
+    case DT_FIFO:
+      return "|";
+    case DT_DIR:
+      return "/";
+    case DT_LNK:
+      return "@";
+    case DT_SOCK:
+      return "=";
+  }
+
+  return "";
+}
+
+static void
+html_escape(const char* src, char* dst, size_t dst_siz)
+{
+  const struct
+  {
+    char c;
+    char* s;
+  } escape[] = {
+    { '&', "&amp;" },  { '<', "&lt;" },    { '>', "&gt;" },
+    { '"', "&quot;" }, { '\'', "&#x27;" },
+  };
+  size_t i, j, k, esclen;
+
+  for (i = 0, j = 0; src[i] != '\0'; i++) {
+    for (k = 0; k < LEN(escape); k++) {
+      if (src[i] == escape[k].c) {
+        break;
+      }
+    }
+    if (k == LEN(escape)) {
+      /* no escape char at src[i] */
+      if (j == dst_siz - 1) {
+        /* silent truncation */
+        break;
+      } else {
+        dst[j++] = src[i];
+      }
+    } else {
+      /* escape char at src[i] */
+      esclen = strlen(escape[k].s);
+
+      if (j >= dst_siz - esclen) {
+        /* silent truncation */
+        break;
+      } else {
+        memcpy(&dst[j], escape[k].s, esclen);
+        j += esclen;
+      }
+    }
+  }
+  dst[j] = '\0';
+}
+
+/* Try to find templates up until root
+ *
+ * Iterates the directory hierarchy upwards. Returns the closest path containing
+ * one of the template files or NULL if none could be found.
+ *
+ * Note that we are chrooted.
+ */
+static char*
+dirl_find_templ_dir(const char* start_path)
+{
+  char* path_buf = calloc(sizeof(char), strlen(start_path)+1);
+  strcat(path_buf, start_path);
+
+  if (strlen(path_buf) > 1 && path_buf[strlen(path_buf) - 1] == '/') {
+    // don't read last dir twice, except at root
+    path_buf[strlen(path_buf) - 1] = '\0';
+  }
+
+  while (strlen(path_buf) != 0) {
+    DIR* cur = opendir(path_buf);
+    struct dirent* de;
+    errno = 0;
+    while ((de = readdir(cur))) {
+      if (de->d_type == DT_REG) {
+        if (!strcmp(DIRL_HEADER, de->d_name) || !strcmp(DIRL_ENTRY, de->d_name) ||
+            !strcmp(DIRL_FOOTER, de->d_name)) {
+          closedir(cur);
+          return path_buf;
+        }
+      }
+    }
+
+    if (strlen(path_buf) > 1) {
+      char* parent = strrchr(path_buf, '/');
+      (*parent) = '\0'; // strip tail from path_buf
+
+      if (strlen(path_buf) == 0) { // we stripped root, let it loop once more
+        path_buf[0] = '/';
+        path_buf[1] = '\0';
+      }
+    } else {
+      path_buf[0] = '\0'; // we checked root, now terminate loop
+    }
+  }
+
+  free(path_buf);
+  return NULL;
+}
+
+/* Helper function to fill template from base+name if file exists */
+static void
+dirl_fill_templ(char** templ, char* base, char* name, char* def)
+{
+  if (!base || !name) {
+    *templ = def;
+    return;
+  }
+
+  char* path = calloc(sizeof(char), strlen(base) + strlen(name));
+  strcpy(path, base);
+  strcat(path, name);
+
+  char* file_buf = read_file(path);
+  free(path);
+
+  if (file_buf) {
+    *templ = file_buf;
+  } else {
+    *templ = def;
+  }
+}
+
+struct dirl_templ
+dirl_read_templ(const char* path)
+{
+  struct dirl_templ templ;
+
+  char* templ_dir = dirl_find_templ_dir(path);
+
+  dirl_fill_templ(&templ.header, templ_dir, DIRL_HEADER, DIRL_HEADER_DEFAULT);
+  dirl_fill_templ(&templ.entry, templ_dir, DIRL_ENTRY, DIRL_ENTRY_DEFAULT);
+  dirl_fill_templ(&templ.footer, templ_dir, DIRL_FOOTER, DIRL_FOOTER_DEFAULT);
+
+  free(templ_dir);
+
+  return templ;
+}
+
+enum status
+dirl_header(int fd, const struct response* res, const struct dirl_templ* templ)
+{
+  /* Replace placeholder */
+  char* nhead = calloc(sizeof(char), strlen(templ->header) + 1);
+  memcpy(nhead, templ->header, strlen(templ->header) + 1);
+  replace(&nhead, "{uri}", res->uri);
+
+  /* Write header */
+  write(fd, nhead, strlen(nhead));
+
+  free(nhead);
+
+  /* listing header */
+  return 0;
+}
+
+enum status
+dirl_entry(int fd,
+           const struct dirent* entry,
+           const struct response* res,
+           const struct dirl_templ* templ)
+{
+  struct stat stat_buf;
+  char* path_buf = calloc(sizeof(char), strlen(res->path)+strlen(entry->d_name));
+  strcat(path_buf, res->uri);
+  strcat(path_buf, entry->d_name);
+  lstat(path_buf, &stat_buf);
+
+  char* nentry = calloc(sizeof(char), strlen(templ->entry) + 1);
+  memcpy(nentry, templ->entry, strlen(templ->entry) + 1);
+
+  /* Replace placeholder */
+  char esc[PATH_MAX * 6];
+  html_escape(entry->d_name, esc, PATH_MAX * 6);
+  replace(&nentry, "{entry}", entry->d_name);
+
+  replace(&nentry, "{suffix}", suffix(entry->d_type));
+
+  char size_buf[1024];
+  if (entry->d_type == DT_REG) {
+    snprintf(size_buf, 1024, "%ld", stat_buf.st_size);
+  } else {
+    sprintf(size_buf, "-");
+  }
+  replace(&nentry, "{size}", size_buf);
+
+  char time_buf[1024];
+  struct tm tm;
+  gmtime_r(&stat_buf.st_mtim.tv_sec, &tm);
+  strftime(time_buf, 1024, "%F %H:%m", &tm);
+  replace(&nentry, "{modified}", time_buf);
+
+  /* Write entry */
+  write(fd, nentry, strlen(nentry));
+
+  free(nentry);
+
+  return 0;
+}
+
+enum status
+dirl_footer(int fd, const struct dirl_templ* templ)
+{
+  /* Replace placeholder */
+  char* nfoot = calloc(sizeof(char), strlen(templ->footer) + 1);
+  memcpy(nfoot, templ->footer, strlen(templ->footer) + 1);
+
+  /* Write footer */
+  write(fd, nfoot, strlen(nfoot));
+
+  free(nfoot);
+  return 0;
+}
+
+int
+dirl_skip(const char* name)
+{
+  return name[0] == '.'                //
+         || !strcmp(name, DIRL_HEADER) //
+         || !strcmp(name, DIRL_ENTRY)  //
+         || !strcmp(name, DIRL_FOOTER) //
+         || !strcmp(name, DIRL_STYLE); //
+}

dirl.h

@@ -0,0 +1,91 @@
+/* See LICENSE file for copyright and license details. */
+#ifndef DIRL_H
+#define DIRL_H
+
+#include <dirent.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include "http.h"
+
+#define DIRL_HEADER ".header.tpl"
+#define DIRL_ENTRY ".entry.tpl"
+#define DIRL_FOOTER ".footer.tpl"
+#define DIRL_STYLE "style.css"
+
+/* Default template definitions
+ *
+ * Used if no template files can be found
+ */
+#define DIRL_HEADER_DEFAULT                                                    \
+  "<!DOCTYPE HTML PUBLIC \" - // W3C//DTD HTML 3.2 Final//EN\">\n"             \
+  "<html>\n"                                                                   \
+  "  <head>\n"                                                                 \
+  "    <link rel=\"stylesheet\" href=\"/" DIRL_STYLE "\">\n"                   \
+  "    <title>Index of {uri}</title>\n"                                        \
+  "  </head>\n"                                                                \
+  "  <body>\n"                                                                 \
+  "    <h1>Index of {uri}</h1>\n"                                              \
+  "    <p><a href=\"..\">&crarr; Parent Directory</a></p>\n"                   \
+  "    <hr />\n"                                                               \
+  "    <table>\n"                                                              \
+  "    <tr><th>Name</th><th>Modified</th><th>Size</th></tr>"
+
+#define DIRL_ENTRY_DEFAULT                                                     \
+  "    <tr>\n"                                                                 \
+  "     <td><a href=\"{entry}\">{entry}{suffix}</a>\n"                         \
+  "     <td>{modified}</td>\n"                                                 \
+  "     <td>{size}</td>\n"                                                     \
+  "    </tr>\n"
+
+#define DIRL_FOOTER_DEFAULT                                                    \
+  "    </table>\n"                                                             \
+  "    <hr />\n"                                                               \
+  "    <p>"                                                                    \
+  "Served by"                                                                  \
+  " <a href=\"http://tools.suckless.org/quark/\">quark</a>"                    \
+  " and"                                                                       \
+  " <a href="                                                                  \
+  "\"https://git.friedl.net/playground/suckless-quark/src/branch/dirlist\">"   \
+  "dirl"                                                                       \
+  "</a>"                                                                       \
+  "</p>\n"                                                                     \
+  "</body>\n"                                                                  \
+  "</html>"
+
+struct dirl_templ
+{
+  char* header;
+  char* entry;
+  char* footer;
+};
+
+struct dirl_templ
+dirl_read_templ(const char* path);
+
+/* Determine if an dirlist entry should be skipped
+ *
+ * Skips:
+ * - hidden files and directories
+ * - special directory entries (., ..)
+ * - header template: DIRL_HEADER
+ * - entry template: DIRL_ENTRY
+ * - footer template: DIRL_FOOTER
+ * - dirlist style: DRIL_STYLE
+ */
+int
+dirl_skip(const char*);
+
+/* Print header into the response */
+enum status
+dirl_header(int, const struct response*, const struct dirl_templ*);
+
+/* Print entry into the response */
+enum status
+dirl_entry(int, const struct dirent*, const struct response*, const struct dirl_templ*);
+
+/* Print footer into the response */
+enum status
+dirl_footer(int, const struct dirl_templ*);
+
+#endif /* DIRL_H */

util.c

@@ -20,107 +20,194 @@ char *argv0;
 static void
 verr(const char *fmt, va_list ap)
 {
-	if (argv0 && strncmp(fmt, "usage", sizeof("usage") - 1)) {
-		fprintf(stderr, "%s: ", argv0);
-	}
+  if (argv0 && strncmp(fmt, "usage", sizeof("usage") - 1)) {
+    fprintf(stderr, "%s: ", argv0);
+  }
 
-	vfprintf(stderr, fmt, ap);
+  vfprintf(stderr, fmt, ap);
 
-	if (fmt[0] && fmt[strlen(fmt) - 1] == ':') {
-		fputc(' ', stderr);
-		perror(NULL);
-	} else {
-		fputc('\n', stderr);
-	}
+  if (fmt[0] && fmt[strlen(fmt) - 1] == ':') {
+    fputc(' ', stderr);
+    perror(NULL);
+  } else {
+    fputc('\n', stderr);
+  }
 }
 
 void
 warn(const char *fmt, ...)
 {
-	va_list ap;
+  va_list ap;
 
-	va_start(ap, fmt);
-	verr(fmt, ap);
-	va_end(ap);
+  va_start(ap, fmt);
+  verr(fmt, ap);
+  va_end(ap);
 }
 
 void
 die(const char *fmt, ...)
 {
-	va_list ap;
+  va_list ap;
 
-	va_start(ap, fmt);
-	verr(fmt, ap);
-	va_end(ap);
+  va_start(ap, fmt);
+  verr(fmt, ap);
+  va_end(ap);
 
-	exit(1);
+  exit(1);
 }
 
 void
 epledge(const char *promises, const char *execpromises)
 {
-	(void)promises;
-	(void)execpromises;
+  (void)promises;
+  (void)execpromises;
 
 #ifdef __OpenBSD__
-	if (pledge(promises, execpromises) == -1) {
-		die("pledge:");
-	}
+  if (pledge(promises, execpromises) == -1) {
+    die("pledge:");
+  }
 #endif /* __OpenBSD__ */
 }
 
 void
 eunveil(const char *path, const char *permissions)
 {
-	(void)path;
-	(void)permissions;
+  (void)path;
+  (void)permissions;
 
 #ifdef __OpenBSD__
-	if (unveil(path, permissions) == -1) {
-		die("unveil:");
-	}
+  if (unveil(path, permissions) == -1) {
+    die("unveil:");
+  }
 #endif /* __OpenBSD__ */
 }
 
 int
 timestamp(char *buf, size_t len, time_t t)
 {
-	struct tm tm;
+  struct tm tm;
 
-	if (gmtime_r(&t, &tm) == NULL ||
-	    strftime(buf, len, "%a, %d %b %Y %T GMT", &tm) == 0) {
-		return 1;
-	}
+  if (gmtime_r(&t, &tm) == NULL ||
+      strftime(buf, len, "%a, %d %b %Y %T GMT", &tm) == 0) {
+    return 1;
+  }
 
-	return 0;
+  return 0;
 }
 
 int
 esnprintf(char *str, size_t size, const char *fmt, ...)
 {
-	va_list ap;
-	int ret;
+  va_list ap;
+  int ret;
 
-	va_start(ap, fmt);
-	ret = vsnprintf(str, size, fmt, ap);
-	va_end(ap);
+  va_start(ap, fmt);
+  ret = vsnprintf(str, size, fmt, ap);
+  va_end(ap);
 
-	return (ret < 0 || (size_t)ret >= size);
+  return (ret < 0 || (size_t)ret >= size);
 }
 
 int
 prepend(char *str, size_t size, const char *prefix)
 {
-	size_t len = strlen(str), prefixlen = strlen(prefix);
+  size_t len = strlen(str), prefixlen = strlen(prefix);
 
-	if (len + prefixlen + 1 > size) {
-		return 1;
-	}
+  if (len + prefixlen + 1 > size) {
+    return 1;
+  }
 
-	memmove(str + prefixlen, str, len + 1);
-	memcpy(str, prefix, prefixlen);
+  memmove(str + prefixlen, str, len + 1);
+  memcpy(str, prefix, prefixlen);
 
-	return 0;
+  return 0;
+}
+
+void
+replace(char **src, const char *old, const char* new) {
+  int old_len = strlen(old);
+  int new_len = strlen(new);
+  int src_len = strlen(*src);
+
+  /* Count needed replacements */
+  const char* tmp = *src;
+  int replc=0;
+  while ((tmp=strstr(tmp, old))) {
+    replc++;
+    tmp += old_len;
+  }
+
+  /* Allocate enough space for the new string */
+  size_t buf_size = src_len + replc * (new_len - old_len) + 1;
+  char* buf = calloc(sizeof(char), buf_size);
+
+  /* Now start replacing */
+  const char *srcidx = *src;
+  const char *srcidx_old = *src;
+  char *bufidx = buf;
+
+  while (replc--) {
+    srcidx_old = strstr(srcidx, old);
+
+    long repl_len = labs(srcidx_old - srcidx);
+    bufidx = strncpy(bufidx, srcidx, repl_len) + repl_len;
+    bufidx = strcpy(bufidx, new) + new_len;
+
+    srcidx = srcidx_old+old_len;
+  }
+
+  strncpy(bufidx, srcidx, strlen(srcidx)); // copy tail
+
+  free(*src);
+  *src = buf;
+}
+
+char*
+read_file(const char* path){
+  FILE* tpl_fp;
+
+  if (!(tpl_fp = fopen(path, "r"))) {
+    return NULL;
+  }
+
+  /* Get size of template */
+  if (fseek(tpl_fp, 0L, SEEK_END) < 0) {
+    fclose(tpl_fp);
+    return NULL;
+  }
+
+  long tpl_size;
+  if ((tpl_size = ftell(tpl_fp)) < 0) {
+    fclose(tpl_fp);
+    return NULL;
+  }
+
+  rewind(tpl_fp);
+
+  /* Read template into tpl_buf */
+  char* tpl_buf = (char*)calloc(sizeof(char), tpl_size);
+
+  if (tpl_buf == NULL) {
+    fclose(tpl_fp);
+    free(tpl_buf);
+    return NULL;
+  }
+
+  if (fread(tpl_buf, 1, tpl_size, tpl_fp) < (size_t) tpl_size) {
+    if (feof(tpl_fp)) {
+      warn("Reached end of file %s prematurely", path);
+    } else if (ferror(tpl_fp)) {
+      warn("Error while reading file %s", path);
+    }
+
+    fclose(tpl_fp);
+    free(tpl_buf);
+    clearerr(tpl_fp);
+
+    return NULL;
+  }
+
+  return tpl_buf;
 }
 
 #define	INVALID  1
@@ -131,39 +218,39 @@ long long
 strtonum(const char *numstr, long long minval, long long maxval,
          const char **errstrp)
 {
-	long long ll = 0;
-	int error = 0;
-	char *ep;
-	struct errval {
-		const char *errstr;
-		int err;
-	} ev[4] = {
-		{ NULL,		0 },
-		{ "invalid",	EINVAL },
-		{ "too small",	ERANGE },
-		{ "too large",	ERANGE },
-	};
+  long long ll = 0;
+  int error = 0;
+  char *ep;
+  struct errval {
+    const char *errstr;
+    int err;
+  } ev[4] = {
+    { NULL,		0 },
+    { "invalid",	EINVAL },
+    { "too small",	ERANGE },
+    { "too large",	ERANGE },
+  };
 
-	ev[0].err = errno;
-	errno = 0;
-	if (minval > maxval) {
-		error = INVALID;
-	} else {
-		ll = strtoll(numstr, &ep, 10);
-		if (numstr == ep || *ep != '\0')
-			error = INVALID;
-		else if ((ll == LLONG_MIN && errno == ERANGE) || ll < minval)
-			error = TOOSMALL;
-		else if ((ll == LLONG_MAX && errno == ERANGE) || ll > maxval)
-			error = TOOLARGE;
-	}
-	if (errstrp != NULL)
-		*errstrp = ev[error].errstr;
-	errno = ev[error].err;
-	if (error)
-		ll = 0;
+  ev[0].err = errno;
+  errno = 0;
+  if (minval > maxval) {
+    error = INVALID;
+  } else {
+    ll = strtoll(numstr, &ep, 10);
+    if (numstr == ep || *ep != '\0')
+      error = INVALID;
+    else if ((ll == LLONG_MIN && errno == ERANGE) || ll < minval)
+      error = TOOSMALL;
+    else if ((ll == LLONG_MAX && errno == ERANGE) || ll > maxval)
+      error = TOOLARGE;
+  }
+  if (errstrp != NULL)
+    *errstrp = ev[error].errstr;
+  errno = ev[error].err;
+  if (error)
+    ll = 0;
 
-	return ll;
+  return ll;
 }
 
 /*
@@ -175,10 +262,10 @@ strtonum(const char *numstr, long long minval, long long maxval,
 void *
 reallocarray(void *optr, size_t nmemb, size_t size)
 {
-	if ((nmemb >= MUL_NO_OVERFLOW || size >= MUL_NO_OVERFLOW) &&
-	    nmemb > 0 && SIZE_MAX / nmemb < size) {
-		errno = ENOMEM;
-		return NULL;
-	}
-	return realloc(optr, size * nmemb);
+  if ((nmemb >= MUL_NO_OVERFLOW || size >= MUL_NO_OVERFLOW) &&
+      nmemb > 0 && SIZE_MAX / nmemb < size) {
+    errno = ENOMEM;
+    return NULL;
+  }
+  return realloc(optr, size * nmemb);
 }

util.h

@@ -52,6 +52,8 @@ void eunveil(const char *, const char *);
 int timestamp(char *, size_t, time_t);
 int esnprintf(char *, size_t, const char *, ...);
 int prepend(char *, size_t, const char *);
+void replace(char **, const char *, const char *);
+char *read_file(const char* path);
 
 void *reallocarray(void *, size_t, size_t);
 long long strtonum(const char *, long long, long long, const char **);