From d81310d55b9b7d07904c19f879f50e52fd7be489 Mon Sep 17 00:00:00 2001
From: guowenxue <guowenxue@gmail.com>
Date: Mon, 06 Nov 2023 16:52:08 +0800
Subject: [PATCH] Add new code
---
ch1_fileIO/dir.c | 2
ch1_fileIO/makefile | 12 +
ch1_fileIO/myls.c | 190 +++++++++++++++++++++++++++
ch1_fileIO/mycp.c | 80 +++++++++++
ch1_fileIO/ds18b20.c | 122 +++++++++++++++++
5 files changed, 405 insertions(+), 1 deletions(-)
diff --git a/ch1_fileIO/dir.c b/ch1_fileIO/dir.c
index e19f48d..f2cb0e8 100644
--- a/ch1_fileIO/dir.c
+++ b/ch1_fileIO/dir.c
@@ -8,7 +8,7 @@
#include <fcntl.h>
-#define TEST_DIR "dir"
+#define TEST_DIR "testdir"
int main(int argc, char **argv)
{
diff --git a/ch1_fileIO/ds18b20.c b/ch1_fileIO/ds18b20.c
new file mode 100644
index 0000000..18fdaaf
--- /dev/null
+++ b/ch1_fileIO/ds18b20.c
@@ -0,0 +1,122 @@
+/*********************************************************************************
+ * Copyright: (C) 2018 LingYun IoT System Studio
+ * All rights reserved.
+ *
+ * Filename: ds18b20.c
+ * Description: This file is temperature sensor DS18B20 code
+ *
+ * Version: 1.0.0(2018/10/14)
+ * Author: Guo Wenxue <guowenxue@gmail.com>
+ * ChangeLog: 1, Release initial version on "2018/10/14 12:13:26"
+ *
+ ********************************************************************************/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <dirent.h>
+#include <string.h>
+#include <time.h>
+#include <errno.h>
+
+int ds18b20_get_temperature(float *temp);
+
+int main(int argc, char *argv[])
+{
+ float temp;
+
+ if( ds18b20_get_temperature(&temp) < 0 )
+ {
+ printf("ERROR: ds18b20 get temprature failure\n");
+ return 1;
+ }
+
+ printf("DS19B20 get temperature: %f ℃\n", temp);
+ return 0;
+}
+
+
+/* File Content:
+ pi@raspberrypi:~/guowenxue $ cat /sys/bus/w1/devices/28-041731f7c0ff/w1_slave
+ 3a 01 4b 46 7f ff 0c 10 a5 : crc=a5 YES
+ 3a 01 4b 46 7f ff 0c 10 a5 t=19625
+ */
+
+int ds18b20_get_temperature(float *temp)
+{
+ char w1_path[50] = "/sys/bus/w1/devices/";
+ char chip[20];
+ char buf[128];
+ DIR *dirp;
+ struct dirent *direntp;
+ int fd =-1;
+ char *ptr;
+ float value;
+ int found = 0;
+
+ if( !temp )
+ {
+ return -1;
+ }
+
+ /*+-------------------------------------------------------------------+
+ *| open dierectory /sys/bus/w1/devices to get chipset Serial Number |
+ *+-------------------------------------------------------------------+*/
+ if((dirp = opendir(w1_path)) == NULL)
+ {
+ printf("opendir error: %s\n", strerror(errno));
+ return -2;
+ }
+
+ while((direntp = readdir(dirp)) != NULL)
+ {
+ if(strstr(direntp->d_name,"28-"))
+ {
+ /* find and get the chipset SN filename */
+ strcpy(chip,direntp->d_name);
+ found = 1;
+ break;
+ }
+ }
+ closedir(dirp);
+
+ if( !found )
+ {
+ printf("Can not find ds18b20 in %s\n", w1_path);
+ return -3;
+ }
+
+ /* get DS18B20 sample file full path: /sys/bus/w1/devices/28-xxxx/w1_slave */
+ strncat(w1_path, chip, sizeof(w1_path)-strlen(w1_path));
+ strncat(w1_path, "/w1_slave", sizeof(w1_path)-strlen(w1_path));
+
+ /* open file /sys/bus/w1/devices/28-xxxx/w1_slave to get temperature */
+ if( (fd=open(w1_path, O_RDONLY)) < 0 )
+ {
+ printf("open %s error: %s\n", w1_path, strerror(errno));
+ return -4;
+ }
+
+ if(read(fd, buf, sizeof(buf)) < 0)
+ {
+ printf("read %s error: %s\n", w1_path, strerror(errno));
+ return -5;
+ }
+
+ ptr = strstr(buf, "t=");
+ if( !ptr )
+ {
+ printf("ERROR: Can not get temperature\n");
+ return -6;
+ }
+
+ ptr+=2;
+
+ /* convert string value to float value */
+ *temp = atof(ptr)/1000;
+
+ close(fd);
+
+ return 0;
+}
diff --git a/ch1_fileIO/makefile b/ch1_fileIO/makefile
new file mode 100644
index 0000000..d010228
--- /dev/null
+++ b/ch1_fileIO/makefile
@@ -0,0 +1,12 @@
+SRCFILES = $(wildcard *.c)
+BINARIES=$(SRCFILES:%.c=%)
+
+all: ${BINARIES}
+
+%: %.c
+ $(CC) $(CFLAGS) -o $@ $< $(LDFLAGS)
+
+clean:
+ @rm -f ${BINARIES}
+ @rm -f *.txt
+ @rm -rf testdir
diff --git a/ch1_fileIO/mycp.c b/ch1_fileIO/mycp.c
new file mode 100644
index 0000000..f32ec42
--- /dev/null
+++ b/ch1_fileIO/mycp.c
@@ -0,0 +1,80 @@
+/*********************************************************************************
+ * Copyright: (C) 2023 LingYun IoT System Studio.
+ * All rights reserved.
+ *
+ * Filename: mycp.c
+ * Description: This file file copy example code, don't not support foler.
+ *
+ * Version: 1.0.0(2023年08月09日)
+ * Author: Guo Wenxue <guowenxue@gmail.com>
+ * ChangeLog: 1, Release initial version on "2023年08月09日 10时09分57秒"
+ *
+ ********************************************************************************/
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <libgen.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+int main (int argc, char **argv)
+{
+ struct stat sbuf;
+ char *progname = basename(argv[0]);
+ char *src, *dst;
+ int fd_src, fd_dst;
+ char buf[2048];
+ int rv, left;
+
+ if( argc != 3 )
+ {
+ printf("Usage: %s [src] [dst]\n", progname);
+ return 0;
+ }
+ src = argv[1];
+ dst = argv[2];
+
+ /* check file type */
+ if( stat(src, &sbuf) )
+ {
+ printf("%s: cannot stat '%s': %s\n", progname, src, strerror(errno));
+ return 2;
+ }
+
+ if( !S_ISREG(sbuf.st_mode) )
+ {
+ printf("%s: %s is not text file\n", progname, src);
+ return 3;
+ }
+
+ /* open files */
+ if( (fd_src=open(src, O_RDONLY)) < 0 )
+ {
+ printf("%s: open '%s' failure: %s\n", progname, src, strerror(errno));
+ return 4;
+ }
+
+ if( (fd_dst=open(dst, O_RDWR|O_TRUNC|O_CREAT, sbuf.st_mode&0x777)) < 0 )
+ {
+ printf("%s: open '%s' failure: %s\n", progname, dst, strerror(errno));
+ return 5;
+ }
+
+ /* copy file content */
+ left = sbuf.st_size;
+ while( left > 0 )
+ {
+ rv = read(fd_src, buf, sizeof(buf));
+ if( rv > 0)
+ {
+ rv = write(fd_dst, buf, rv);
+ left -= rv;
+ }
+ }
+
+ return 0;
+}
+
diff --git a/ch1_fileIO/myls.c b/ch1_fileIO/myls.c
new file mode 100644
index 0000000..3fe501c
--- /dev/null
+++ b/ch1_fileIO/myls.c
@@ -0,0 +1,190 @@
+/*********************************************************************************
+ * Copyright: (C) 2023 LingYun IoT System Studio.
+ * All rights reserved.
+ *
+ * Filename: mycp.c
+ * Description: This file is ls command example code.
+ *
+ * Version: 1.0.0(2023年08月08日)
+ * Author: Guo Wenxue <guowenxue@gmail.com>
+ * ChangeLog: 1, Release initial version on "2023年08月08日 17时17分00秒"
+ *
+ ********************************************************************************/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <dirent.h>
+#include <time.h>
+#include <pwd.h>
+#include <grp.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#define PROGNAME "myls"
+
+static int myls(char *path);
+
+int main (int argc, char **argv)
+{
+ int fd;
+ int i;
+
+ if( 1 == argc )
+ {
+ myls(".");
+ return 0;
+ }
+
+ for(i=1; i<argc; i++)
+ {
+ myls(argv[i]);
+ }
+
+ return 0;
+}
+
+void print_filemode(mode_t mode)
+{
+ /* print file type */
+ if( S_ISREG(mode) )
+ {
+ printf("-");
+ }
+ else if( S_ISDIR(mode) )
+ {
+ printf("d");
+ }
+ else if( S_ISCHR(mode) )
+ {
+ printf("c");
+ }
+ else if( S_ISBLK(mode) )
+ {
+ printf("b");
+ }
+ else if( S_ISFIFO(mode) )
+ {
+ printf("f");
+ }
+ else if( S_ISLNK(mode) )
+ {
+ printf("l");
+ }
+ else if( S_ISSOCK(mode) )
+ {
+ printf("s");
+ }
+
+ /* print file mode */
+ printf("%c", (S_IRUSR&mode) ? 'r' : '-');
+ printf("%c", (S_IWUSR&mode) ? 'w' : '-');
+ printf("%c", (S_IXUSR&mode) ? 'x' : '-');
+
+ printf("%c", (S_IRGRP&mode) ? 'r' : '-');
+ printf("%c", (S_IWGRP&mode) ? 'w' : '-');
+ printf("%c", (S_IXGRP&mode) ? 'x' : '-');
+
+ printf("%c", (S_IROTH&mode) ? 'r' : '-');
+ printf("%c", (S_IWOTH&mode) ? 'w' : '-');
+ printf("%c", (S_IXOTH&mode) ? 'x' : '-');
+
+ printf(" ");
+
+ return ;
+}
+
+int print_info(char *file)
+{
+ struct stat sbuf;
+ struct passwd *u;
+ struct group *g;
+ time_t t;
+ struct tm *ptm;
+ char mtime[32];
+
+ stat(file, &sbuf);
+
+ print_filemode(sbuf.st_mode);
+
+ /* print number of hard links */
+ printf("%2lu ", sbuf.st_nlink);
+
+ /* print user name or user id */
+ u = getpwuid (sbuf.st_uid);
+ if( u )
+ printf("%s ", u->pw_name);
+ else
+ printf("%d ", sbuf.st_uid);
+
+ /* print group name or group id */
+ g = getgrgid (sbuf.st_gid);
+ if( g )
+ printf("%s ", g->gr_name);
+ else
+ printf("%d ", sbuf.st_uid);
+
+ /* print file size */
+ printf("%6lu ", sbuf.st_size);
+
+ /* print time of last modification, Time functions:
+ * https://www.jianshu.com/p/e92ced44f216
+ * https://blog.csdn.net/chen1415886044/article/details/106883544
+ */
+ t = (time_t)sbuf.st_mtim.tv_sec;
+ ptm = localtime(&t);
+ strftime(mtime, sizeof(mtime), "%b %e %R", ptm);
+ printf("%s ", mtime);
+
+ printf("%s", file);
+
+ printf("\n");
+
+ return 0;
+}
+
+int myls(char *path)
+{
+ struct stat sbuf;
+ DIR *dirp;
+ struct dirent *dir;
+ char filepath[512];
+
+ /* Check file exist or not */
+ if( access(path, F_OK) )
+ {
+ printf("%s: cannot access '%s': %s\n", PROGNAME, path, strerror(errno));
+ return -2;
+ }
+
+ stat(path, &sbuf);
+
+ /* list file */
+ if( !S_ISDIR(sbuf.st_mode) )
+ {
+ print_info(path);
+ return 0;
+ }
+
+ /* list folder */
+ dirp = opendir(path);
+ if( !dirp )
+ {
+ printf("%s: cannot open directory '%s': %s\n", PROGNAME, path, strerror(errno));
+ return -3;
+ }
+
+ while( NULL != (dir=readdir(dirp)) )
+ {
+ if( !strcmp(path, ".") )
+ strncpy(filepath, dir->d_name, sizeof(filepath));
+ else
+ snprintf(filepath, sizeof(filepath), "%s/%s", path, dir->d_name);
+
+ print_info(filepath);
+ }
+
+ return 0;
+}
--
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