Add option -r to env import to allow import of text files with CRLF as line endings

When this option is enabled, CRLF is treated like LF when importing environments
from text files, which means CRs ('\r') in front of LFs ('\n') are just ignored.

Drawback of enabling this option is that (maybe exported) variables which have
a trailing CR in their content will get imported without that CR. But this
drawback is very unlikely and the big advantage of letting Windows user create
a *working* uEnv.txt too is likely more welcome.

Signed-off-by: Alexander Holler <holler@ahsoftware.de>

common/cmd_nvedit.c

@@ -950,11 +950,15 @@ sep_err:
 
 #ifdef CONFIG_CMD_IMPORTENV
 /*
- * env import [-d] [-t | -b | -c] addr [size]
+ * env import [-d] [-t [-r] | -b | -c] addr [size]
  *	-d:	delete existing environment before importing;
  *		otherwise overwrite / append to existion definitions
  *	-t:	assume text format; either "size" must be given or the
  *		text data must be '\0' terminated
+ *	-r:	handle CRLF like LF, that means exported variables with
+ *		a content which ends with \r won't get imported. Used
+ *		to import text files created with editors which are using CRLF
+ *		for line endings. Only effective in addition to -t.
  *	-b:	assume binary format ('\0' separated, "\0\0" terminated)
  *	-c:	assume checksum protected environment format
  *	addr:	memory address to read from
@@ -970,6 +974,7 @@ static int do_env_import(cmd_tbl_t *cmdtp, int flag,
 	int	chk = 0;
 	int	fmt = 0;
 	int	del = 0;
+	int	crlf_is_lf = 0;
 	size_t	size;
 
 	cmd = *argv;
@@ -994,6 +999,9 @@ static int do_env_import(cmd_tbl_t *cmdtp, int flag,
 					goto sep_err;
 				sep = '\n';
 				break;
+			case 'r':		/* handle CRLF like LF */
+				crlf_is_lf = 1;
+				break;
 			case 'd':
 				del = 1;
 				break;
@@ -1009,6 +1017,9 @@ static int do_env_import(cmd_tbl_t *cmdtp, int flag,
 	if (!fmt)
 		printf("## Warning: defaulting to text format\n");
 
+	if (sep != '\n' && crlf_is_lf )
+		crlf_is_lf = 0;
+
 	addr = simple_strtoul(argv[0], NULL, 16);
 	ptr = map_sysmem(addr, 0);
 
@@ -1050,8 +1061,8 @@ static int do_env_import(cmd_tbl_t *cmdtp, int flag,
 		ptr = (char *)ep->data;
 	}
 
-	if (himport_r(&env_htab, ptr, size, sep, del ? 0 : H_NOCLEAR, 0,
-		      NULL) == 0) {
+	if (himport_r(&env_htab, ptr, size, sep, del ? 0 : H_NOCLEAR,
+			crlf_is_lf, 0, NULL) == 0) {
 		error("Environment import failed: errno = %d\n", errno);
 		return 1;
 	}
@@ -1180,7 +1191,7 @@ static char env_help_text[] =
 #endif
 #endif
 #if defined(CONFIG_CMD_IMPORTENV)
-	"env import [-d] [-t | -b | -c] addr [size] - import environment\n"
+	"env import [-d] [-t [-r] | -b | -c] addr [size] - import environment\n"
 #endif
 	"env print [-a | name ...] - print environment\n"
 #if defined(CONFIG_CMD_RUN)

common/env_common.c

@@ -118,7 +118,7 @@ void set_default_env(const char *s)
 	}
 
 	if (himport_r(&env_htab, (char *)default_environment,
-			sizeof(default_environment), '\0', flags,
+			sizeof(default_environment), '\0', flags, 0,
 			0, NULL) == 0)
 		error("Environment import failed: errno = %d\n", errno);
 
@@ -135,7 +135,7 @@ int set_default_vars(int nvars, char * const vars[])
 	 */
 	return himport_r(&env_htab, (const char *)default_environment,
 				sizeof(default_environment), '\0',
-				H_NOCLEAR | H_INTERACTIVE, nvars, vars);
+				H_NOCLEAR | H_INTERACTIVE, 0, nvars, vars);
 }
 
 #ifdef CONFIG_ENV_AES
@@ -212,7 +212,7 @@ int env_import(const char *buf, int check)
 		return ret;
 	}
 
-	if (himport_r(&env_htab, (char *)ep->data, ENV_SIZE, '\0', 0,
+	if (himport_r(&env_htab, (char *)ep->data, ENV_SIZE, '\0', 0, 0,
 			0, NULL)) {
 		gd->flags |= GD_FLG_ENV_READY;
 		return 1;

include/search.h

@@ -102,7 +102,8 @@ extern ssize_t hexport_r(struct hsearch_data *__htab,
  */
 extern int himport_r(struct hsearch_data *__htab,
 		     const char *__env, size_t __size, const char __sep,
-		     int __flag, int nvars, char * const vars[]);
+		     int __flag, int __crlf_is_lf, int nvars,
+		     char * const vars[]);
 
 /* Walk the whole table calling the callback on each element */
 extern int hwalk_r(struct hsearch_data *__htab, int (*callback)(ENTRY *));

lib/hashtable.c

@@ -776,7 +776,7 @@ static int drop_var_from_set(const char *name, int nvars, char * vars[])
 
 int himport_r(struct hsearch_data *htab,
 		const char *env, size_t size, const char sep, int flag,
-		int nvars, char * const vars[])
+		int crlf_is_lf, int nvars, char * const vars[])
 {
 	char *data, *sp, *dp, *name, *value;
 	char *localvars[nvars];
@@ -841,6 +841,21 @@ int himport_r(struct hsearch_data *htab,
 		}
 	}
 
+	if(!size)
+		return 1;		/* everything OK */
+	if(crlf_is_lf) {
+		/* Remove Carriage Returns in front of Line Feeds */
+		unsigned ignored_crs = 0;
+		for(;dp < data + size && *dp; ++dp) {
+			if(*dp == '\r' &&
+			   dp < data + size - 1 && *(dp+1) == '\n')
+				++ignored_crs;
+			else
+				*(dp-ignored_crs) = *dp;
+		}
+		size -= ignored_crs;
+		dp = data;
+	}
 	/* Parse environment; allow for '\0' and 'sep' as separators */
 	do {
 		ENTRY e, *rv;