lovelove工作

2024-05-13 17:20:11 +08:00
parent 3594812944
commit 1b796adfc3
8 changed files with 566 additions and 0 deletions
--- a/C13-Linux系统编程/fs/mydate.c
+++ b/C13-Linux系统编程/fs/mydate.c
@@ -0,0 +1,109 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+
+#define TIMESTRSIZE 1024
+#define FMTSTRSIZE  1024
+
+/**
+ * @brief    mydate
+ * @details
+ *           Usage:
+ *               mydate [-H 12|24] [-y 2|4] [-m] [-d] [-M] [-S]
+ *           Options:
+ *               -y: year 2位,4位
+ *               -m: month
+ *               -d: day
+ *               -H: hour 12小时制,24小时制
+ *               -M: minute
+ *               -S: second
+ *
+ * @param    argc
+ * @param    argv
+ *
+ * @return  int
+ */
+int main(int argc, char **argv)
+{
+    time_t     stamp;
+    struct tm *tm;
+    char       timestr[TIMESTRSIZE];
+    int        c;
+    char       fmtstr[FMTSTRSIZE];
+    fmtstr[0] = '\0';
+    FILE *fp  = stdout;
+
+    time(&stamp);
+    tm = localtime(&stamp);
+
+    while (1)
+    {
+        //* 选项传参
+        // c = getopt(argc, argv, "H:y:MSmd");
+
+        //* 加'-'，接收非选项传参
+        c = getopt(argc, argv, "-H:y:MSmd");
+        if (c < 0)
+            break;
+
+        switch (c)
+        {
+            //* 非选项传参，返回1
+        case 1:
+            if (stdout == fp)   //! 先入为主
+            {
+                fp = fopen(argv[optind - 1], "w");
+                if (NULL == fp)
+                {
+                    perror("fopen()");
+                    fp = stdout;
+                }
+            }
+            break;
+
+        case 'H':
+            if (0 == strcmp(optarg, "12"))
+                strncat(fmtstr, "%I(%P) ", FMTSTRSIZE - 1);
+            else if (0 == strcmp(optarg, "24"))
+                strncat(fmtstr, "%H ", FMTSTRSIZE - 1);
+            else
+                fprintf(stderr,
+                        "Usage: %s [-H 12|24] [-y 2|4] [-m] [-d] [-M] [-S]\n",
+                        argv[0]);
+            break;
+
+        case 'M': strncat(fmtstr, "%M ", FMTSTRSIZE - 1); break;
+
+        case 'S': strncat(fmtstr, "%S ", FMTSTRSIZE - 1); break;
+
+        case 'y':
+            if (0 == strcmp(optarg, "2"))
+                strncat(fmtstr, "%y ", FMTSTRSIZE - 1);
+            else if (0 == strcmp(optarg, "4"))
+                strncat(fmtstr, "%Y ", FMTSTRSIZE - 1);
+            else
+                fprintf(stderr,
+                        "Usage: %s [-H 12|24] [-y 2|4] [-m] [-d] [-M] [-S]\n",
+                        argv[0]);
+            break;
+
+        case 'm': strncat(fmtstr, "%m ", FMTSTRSIZE - 1); break;
+
+        case 'd': strncat(fmtstr, "%d ", FMTSTRSIZE - 1); break;
+
+        default: break;
+        }
+    }
+
+    strncat(fmtstr, "\n", FMTSTRSIZE - 1);
+    strftime(timestr, TIMESTRSIZE, fmtstr, tm);
+
+    fputs(timestr, fp);
+
+    if (fp != stdout)
+        fclose(fp);
+
+    exit(0);
+}