Add touch from Choubey Ji.

diff --git a/toys/posix/touch.c b/toys/posix/touch.c
new file mode 100644 (file)
index 0000000..3f2becb
--- /dev/null
+++ b/toys/posix/touch.c
@@ -0,0 +1,157 @@
+/* vi: set sw=4 ts=4:
+ *
+ * touch.c : change timestamp of a file
+ *  Copyright 2012 Choubey Ji <warior.linux@gmail.com>
+ *
+ * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/touch.html 
+
+USE_TOUCH(NEWTOY(touch, "mrt", TOYFLAG_BIN))
+
+config TOUCH
+  bool "th"
+  default y
+  help
+    Usage: Usage: touch [OPTION]... FILE...
+    Update the access and modification times of each FILE to the current time.
+    -m                     change only the modification time
+    -r, --reference=FILE   use this file's times instead of current time
+    -t STAMP               use [[CC]YY]MMDDhhmm[.ss] instead of current time
+
+*/
+
+
+#include "toys.h"
+
+time_t get_time_sec(char *);
+
+void touch_main(void){
+  int fd, touch_flag_t = 0, touch_flag_m = 0, touch_flag_r = 0;
+  time_t now;
+  struct utimbuf modinfo;
+  struct stat filestat;    
+  if(!toys.optflags){
+    time(&now);
+    modinfo.modtime = now;
+    modinfo.actime = now;
+    }else{
+      if(toys.optflags & 1){
+        touch_flag_t = 1;
+        if((toys.optflags >> 2) & 1){
+          touch_flag_m = 1;
+        }
+      }
+
+      if((toys.optflags >> 1) & 1)
+        touch_flag_r = 1;
+
+      if(toys.optflags >> 2)
+        touch_flag_m = 1;
+    }
+
+  if(touch_flag_t){
+    if(!check_date_format(toys.optargs[0])){
+      modinfo.modtime = get_time_sec((char *)toys.optargs[0]);
+      modinfo.actime = get_time_sec(toys.optargs[0]);
+    }else{
+      perror_msg("Invalid date format, -t [yyyyMMddhhmm.ss]");
+      toys.exitval = EXIT_FAILURE;
+    }
+  }
+  if(touch_flag_r){
+    if(stat(toys.optargs[0], &filestat) < 0){
+      printf("Error : unable to get information for file %s\n", toys.optargs[0]);
+      toys.exitval = EXIT_FAILURE;
+    }
+    modinfo.modtime = filestat.st_mtime;
+    modinfo.actime = filestat.st_atime;
+  }
+  if(touch_flag_m){
+    if(stat(toys.optargs[toys.optc - 1], &filestat) < 0){
+      toys.exitval = EXIT_FAILURE;
+      return;
+    }
+    modinfo.actime = filestat.st_atime;
+    if(!(touch_flag_r | touch_flag_t)){
+      time(&now);
+      modinfo.modtime = now;
+    }
+  }
+  if(utime(toys.optargs[toys.optc - 1], &modinfo) == -1){
+    if((fd = open(toys.optargs[toys.optc - 1],O_CREAT |O_RDWR, 0644)) != -1){
+      close(fd);
+      utime(toys.optargs[toys.optc - 1], &modinfo);
+    }else{
+      perror("unable to create the file");
+      toys.exitval = EXIT_FAILURE;
+    }
+  }
+}
+
+int check_date_format(char *date_input){
+  int count_date_digit = 0;
+  unsigned long long flag_b4_sec;
+  int  flag_af_sec;
+  char *date_store = (char *)malloc(12 * sizeof(char));
+  while(date_input[count_date_digit] != '.'){
+    date_store[count_date_digit] = date_input[count_date_digit];
+    count_date_digit++;
+  }
+  date_store[count_date_digit++] = '\0';
+  flag_b4_sec = atoll(date_store);
+  date_store[0] = date_input[count_date_digit++];
+  date_store[1] = date_input[count_date_digit];
+  date_store[2] = '\0';
+  flag_af_sec = atoi(date_store);
+  if(date_store[0] == '0' && date_store[1] == '0')
+    flag_af_sec = 1;
+  if(flag_b4_sec && flag_af_sec)
+    return 0;
+  else
+    return -1;
+}
+
+/* function to return number of seconds since epoch till the given date */
+time_t get_time_sec(char *date_input){
+  int count_date_digit = 0;
+  char temp_date[12];
+  char mm[2];
+  char dd[2];
+  char hh[2];
+  char ss[2];
+  char year[4];
+  time_t time_of_modify;
+  struct tm t_yyyymmddhhss;
+  while(date_input[count_date_digit] != '.'){
+    if(count_date_digit < 4){
+      year[count_date_digit] = date_input[count_date_digit];
+    }
+    count_date_digit++;
+    if(count_date_digit == 4){
+      year[count_date_digit] = '\0';
+      t_yyyymmddhhss.tm_year = atoi(year)-1900;
+      break;
+    }
+  }
+  mm[0] = date_input[4];
+  mm[1] = date_input[5];
+  mm[2] = '\0';
+  t_yyyymmddhhss.tm_mon = (atoi(mm) - 1);
+  mm[0] = date_input[6];
+  mm[1] = date_input[7];
+  mm[2] = '\0';
+  t_yyyymmddhhss.tm_mday = atoi(mm);
+  mm[0] = date_input[8];
+  mm[1] = date_input[9];
+  mm[2] = '\0';
+  t_yyyymmddhhss.tm_hour = atoi(mm);
+  mm[0] = date_input[10];
+  mm[1] = date_input[11];
+  mm[2] = '\0';
+  t_yyyymmddhhss.tm_min = atoi(mm);
+  mm[0] = date_input[13];
+  mm[1] = date_input[14];
+  mm[2] = '\0';
+  t_yyyymmddhhss.tm_sec = atoi(mm);
+  time_of_modify = mktime(&t_yyyymmddhhss);
+  return time_of_modify;
+}