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new 46b8774f7 system/grep: Add grep command with regex support
46b8774f7 is described below
commit 46b8774f7f3306cb1efcd8bb5bda22dfac993b42
Author: Junbo Zheng <[email protected]>
AuthorDate: Thu Aug 20 23:26:24 2026 +0800
system/grep: Add grep command with regex support
Add a standalone grep application under apps/system/grep/. It uses the
NuttX libc regex library (regcomp/regexec) to support -i, -n, -v, -r,
-H and -h options plus stdin input and recursive directory search.
SYSTEM_GREP depends on LIBC_REGEX, so the regex library must be enabled
first -- CONFIG_SYSTEM_GREP only becomes selectable once LIBC_REGEX is
turned on.
Signed-off-by: Junbo Zheng <[email protected]>
---
system/grep/CMakeLists.txt | 36 ++++++
system/grep/Kconfig | 30 +++++
system/grep/Make.defs | 25 ++++
system/grep/Makefile | 36 ++++++
system/grep/grep_main.c | 307 +++++++++++++++++++++++++++++++++++++++++++++
5 files changed, 434 insertions(+)
diff --git a/system/grep/CMakeLists.txt b/system/grep/CMakeLists.txt
new file mode 100644
index 000000000..b533eb522
--- /dev/null
+++ b/system/grep/CMakeLists.txt
@@ -0,0 +1,36 @@
+#
##############################################################################
+# apps/system/grep/CMakeLists.txt
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
contributor
+# license agreements. See the NOTICE file distributed with this work for
+# additional information regarding copyright ownership. The ASF licenses this
+# file to you under the Apache License, Version 2.0 (the "License"); you may
not
+# use this file except in compliance with the License. You may obtain a copy
of
+# the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations under
+# the License.
+#
+#
##############################################################################
+
+if(CONFIG_SYSTEM_GREP)
+ nuttx_add_application(
+ MODULE
+ ${CONFIG_SYSTEM_GREP}
+ NAME
+ ${CONFIG_SYSTEM_GREP_PROGNAME}
+ STACKSIZE
+ ${CONFIG_SYSTEM_GREP_STACKSIZE}
+ PRIORITY
+ ${CONFIG_SYSTEM_GREP_PRIORITY}
+ SRCS
+ grep_main.c)
+
+endif()
diff --git a/system/grep/Kconfig b/system/grep/Kconfig
new file mode 100644
index 000000000..59f96c318
--- /dev/null
+++ b/system/grep/Kconfig
@@ -0,0 +1,30 @@
+#
+# For a description of the syntax of this configuration file,
+# see the file kconfig-language.txt in the NuttX tools repository.
+#
+
+config SYSTEM_GREP
+ tristate "system 'grep' command"
+ default n
+ depends on LIBC_REGEX
+ ---help---
+ Enable support for the system 'grep' command (regex-based
search).
+
+if SYSTEM_GREP
+
+config SYSTEM_GREP_PROGNAME
+ string "grep program name"
+ default "grep"
+ ---help---
+ This is the name of the program that will be used when the grep
+ program is installed.
+
+config SYSTEM_GREP_PRIORITY
+ int "grep task priority"
+ default 100
+
+config SYSTEM_GREP_STACKSIZE
+ int "grep stack size"
+ default DEFAULT_TASK_STACKSIZE
+
+endif
diff --git a/system/grep/Make.defs b/system/grep/Make.defs
new file mode 100644
index 000000000..01d23c35b
--- /dev/null
+++ b/system/grep/Make.defs
@@ -0,0 +1,25 @@
+############################################################################
+# apps/system/grep/Make.defs
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements. See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership. The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+ifneq ($(CONFIG_SYSTEM_GREP),)
+CONFIGURED_APPS += $(APPDIR)/system/grep
+endif
diff --git a/system/grep/Makefile b/system/grep/Makefile
new file mode 100644
index 000000000..50ff3e0ee
--- /dev/null
+++ b/system/grep/Makefile
@@ -0,0 +1,36 @@
+############################################################################
+# apps/system/grep/Makefile
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements. See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership. The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+include $(APPDIR)/Make.defs
+
+# Standalone grep command
+
+PROGNAME = $(CONFIG_SYSTEM_GREP_PROGNAME)
+PRIORITY = $(CONFIG_SYSTEM_GREP_PRIORITY)
+STACKSIZE = $(CONFIG_SYSTEM_GREP_STACKSIZE)
+MODULE = $(CONFIG_SYSTEM_GREP)
+
+# Files
+
+MAINSRC = grep_main.c
+
+include $(APPDIR)/Application.mk
diff --git a/system/grep/grep_main.c b/system/grep/grep_main.c
new file mode 100644
index 000000000..3d770b965
--- /dev/null
+++ b/system/grep/grep_main.c
@@ -0,0 +1,307 @@
+/****************************************************************************
+ * apps/system/grep/grep_main.c
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership. The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <dirent.h>
+#include <errno.h>
+#include <regex.h>
+#include <limits.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#define GREP_F_INVERT (1u << 0) /* -v: invert match */
+#define GREP_F_ICASE (1u << 1) /* -i: case-insensitive */
+#define GREP_F_LINENO (1u << 2) /* -n: print line number */
+#define GREP_F_RECURSE (1u << 3) /* -r: recurse into directories */
+#define GREP_F_NAME (1u << 4) /* -H: always print filename */
+#define GREP_F_NONAME (1u << 5) /* -h: never print filename */
+
+#define GREP_LINE_MAX 512
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+static int grep_stream(FILE *in, FAR const char *label,
+ FAR const regex_t *re, unsigned int flags)
+{
+ char line[GREP_LINE_MAX];
+ unsigned long lineno = 0;
+ int matched = 0;
+
+ while (fgets(line, sizeof(line), in) != NULL)
+ {
+ size_t n = strlen(line);
+ int hit;
+
+ if (n > 0 && line[n - 1] == '\n')
+ {
+ line[n - 1] = '\0';
+ }
+
+ lineno++;
+
+ hit = (regexec(re, line, 0, NULL, 0) == 0);
+ if (flags & GREP_F_INVERT)
+ {
+ hit = !hit;
+ }
+
+ if (hit)
+ {
+ matched = 1;
+ if (label != NULL && !(flags & GREP_F_NONAME))
+ {
+ printf("%s:", label);
+ }
+
+ if (flags & GREP_F_LINENO)
+ {
+ printf("%lu:", lineno);
+ }
+
+ printf("%s\n", line);
+ }
+ }
+
+ return matched ? 0 : 1;
+}
+
+static int grep_file(FAR const char *path, FAR const regex_t *re,
+ unsigned int flags, int multi)
+{
+ FILE *f = fopen(path, "r");
+ FAR const char *label = (multi || (flags & GREP_F_NAME)) ? path : NULL;
+ int rc;
+
+ if (f == NULL)
+ {
+ fprintf(stderr, "grep: %s: %s\n", path, strerror(errno));
+ return 2;
+ }
+
+ rc = grep_stream(f, label, re, flags);
+ fclose(f);
+ return rc;
+}
+
+static int grep_dir(FAR const char *path, FAR const regex_t *re,
+ unsigned int flags, int multi)
+{
+ FAR DIR *d = opendir(path);
+ char full[PATH_MAX];
+ int rc = 1;
+ FAR struct dirent *e;
+
+ if (d == NULL)
+ {
+ fprintf(stderr, "grep: %s: %s\n", path, strerror(errno));
+ return 2;
+ }
+
+ while ((e = readdir(d)) != NULL)
+ {
+ struct stat st;
+
+ if (strcmp(e->d_name, ".") == 0 || strcmp(e->d_name, "..") == 0)
+ {
+ continue;
+ }
+
+ snprintf(full, sizeof(full), "%s/%s", path, e->d_name);
+
+ if (stat(full, &st) != 0)
+ {
+ continue;
+ }
+
+ if (S_ISDIR(st.st_mode))
+ {
+ if (flags & GREP_F_RECURSE)
+ {
+ int r = grep_dir(full, re, flags, multi);
+
+ if (r == 0)
+ {
+ rc = 0;
+ }
+ else if (r == 2 && rc != 0)
+ {
+ rc = 2;
+ }
+ }
+ }
+ else if (S_ISREG(st.st_mode))
+ {
+ int r = grep_file(full, re, flags, multi);
+
+ if (r == 0)
+ {
+ rc = 0;
+ }
+ }
+ }
+
+ closedir(d);
+ return rc;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+int main(int argc, FAR char **argv)
+{
+ unsigned int flags = 0;
+ FAR const char *pattern;
+ int idx;
+ int cflags = REG_NOSUB;
+ int nfiles;
+ int multi;
+ int rc = 1;
+ regex_t re;
+ int err;
+
+ for (idx = 1; idx < argc; idx++)
+ {
+ FAR const char *p;
+
+ if (argv[idx][0] != '-' || argv[idx][1] == '\0')
+ {
+ break;
+ }
+
+ for (p = argv[idx] + 1; *p != '\0'; p++)
+ {
+ switch (*p)
+ {
+ case 'i':
+ flags |= GREP_F_ICASE;
+ break;
+ case 'v':
+ flags |= GREP_F_INVERT;
+ break;
+ case 'n':
+ flags |= GREP_F_LINENO;
+ break;
+ case 'r':
+ flags |= GREP_F_RECURSE;
+ break;
+ case 'H':
+ flags |= GREP_F_NAME;
+ break;
+ case 'h':
+ flags |= GREP_F_NONAME;
+ break;
+ default:
+ fprintf(stderr, "grep: invalid option -%c\n", *p);
+ return 2;
+ }
+ }
+ }
+
+ if (idx >= argc)
+ {
+ fprintf(stderr, "usage: grep [-invrHh] <pattern> [<file>...]\n");
+ return 2;
+ }
+
+ pattern = argv[idx++];
+
+ if (flags & GREP_F_ICASE)
+ {
+ cflags |= REG_ICASE;
+ }
+
+ err = regcomp(&re, pattern, cflags);
+ if (err != 0)
+ {
+ char errbuf[128];
+
+ regerror(err, &re, errbuf, sizeof(errbuf));
+ fprintf(stderr, "grep: %s\n", errbuf);
+ return 2;
+ }
+
+ nfiles = argc - idx;
+ multi = (nfiles > 1) || (flags & GREP_F_RECURSE);
+
+ if (nfiles == 0)
+ {
+ rc = grep_stream(stdin, NULL, &re, flags);
+ }
+ else
+ {
+ for (; idx < argc; idx++)
+ {
+ struct stat st;
+ int r;
+
+ if (stat(argv[idx], &st) != 0)
+ {
+ fprintf(stderr, "grep: %s: %s\n", argv[idx], strerror(errno));
+ rc = 2;
+ continue;
+ }
+
+ if (S_ISDIR(st.st_mode))
+ {
+ if (flags & GREP_F_RECURSE)
+ {
+ r = grep_dir(argv[idx], &re, flags, multi);
+ }
+ else
+ {
+ fprintf(stderr, "grep: %s: Is a directory\n", argv[idx]);
+ r = 2;
+ }
+ }
+ else
+ {
+ r = grep_file(argv[idx], &re, flags, multi);
+ }
+
+ if (r == 0)
+ {
+ rc = 0;
+ }
+ }
+ }
+
+ regfree(&re);
+ return rc;
+}
