Changeset 969 in MondoRescue

Timestamp:

Nov 23, 2006, 6:24:03 PM (17 years ago)

Author:

Bruno Cornec

Message:

mr_str now contains all string functions (removal of mr_string from trunk)

Location:

trunk/mondo/src

Files:

• common/mr_string.c (deleted)
• lib/mr_str.c (modified) (1 diff)

trunk/mondo/src/lib/mr_str.c

@@ -1 @@
-/* 
-   $Id$
-*/
+/*
+ * $Id$
+ *
+ * New generation of string handling functions safe from a memory management point of view 
+ * Developped by Andree Leidenfrost
+ */
 
 #include <stdio.h>
 #include <string.h>
-
-/* New functions safe from a memory manageemnt point of view */
-/* Developped by Andree Leidenfrost */
+ 
 /**
+ * Safe alternative to standard function strok()
  * Build a partition name from a drive and a partition number.
- * @param instr 
- * @param delims 
- * @param lastpos 
- * @return @p 
+ * @param instr
+ * @param delims
+ * @param lastpos
+ * @return @p
  * @note this function allocates memory that needs to be freed by caller
  **/
+char *mr_strtok(char *instr, const char *delims, int *lastpos)
+{
 
+    char *token = NULL;
+    char *strptr = NULL;
+    size_t pos1 = 0;
+    size_t pos2 = 0;
 
-char *mr_strtok(char *instr, const char *delims, int *lastpos) {
+    if (strlen(instr) <= *lastpos) {
+        *lastpos = 0;
+        return token;
+    }
 
-char *token = NULL;
-char *strptr = NULL;
-size_t pos1 = 0;
-size_t pos2 = 0;
+    strptr = instr + *lastpos;
+    pos2 = strspn(strptr, delims);
+    strptr += pos2;
+    pos1 = strcspn(strptr, delims);
+    token = malloc(sizeof(*token) * (pos1 + 1));
+    strncpy(token, strptr, pos1);
+    token[pos1] = '\0';
+    *lastpos = *lastpos + pos1 + pos2 + 1;
 
-if (strlen(instr) <= *lastpos) {
-    *lastpos = 0;
     return token;
 }
 
-strptr = instr + *lastpos;
-pos2 = strspn(strptr, delims);
-strptr += pos2;
-pos1 = strcspn(strptr, delims);
-token = malloc(sizeof(*token)*(pos1+1));
-strncpy(token, strptr, pos1);
-token[pos1] = '\0';
-*lastpos = *lastpos + pos1 + pos2 + 1;
 
-return token;
+/**
+ * Returns the string fed to it 'inptr' with all characters to escape given
+ * in 'toesc' prepended by escaping character 'escchr'.
+ * (Prepare strings for use in system() or popen() with this function.)
+ * @param instr
+ * @param toesc
+ * @param escchr
+ * @note this function allocates memory that needs to be freed by caller
+ **/
+char *mr_stresc(char *instr, char *toesc, const char escchr)
+{
+
+    char *inptr = NULL;
+    char *retstr = NULL;
+    char *retptr = NULL;
+    char *escptr = NULL;
+    int cnt = 0;
+
+    inptr = instr;
+
+    // Count how many characters need escaping.
+    while (*inptr != '\0') {
+        escptr = toesc;
+        while (*escptr != '\0') {
+            if (*inptr == *escptr) {
+                // Found it, skip the rest.
+                cnt++;
+                inptr++;
+                break;
+            }
+            inptr++;
+            escptr++;
+        }
+    }
+    inptr = instr;
+
+    retstr = (char *) malloc(strlen(inptr) + cnt + 1);
+    retptr = retstr;
+
+    // Prepend specified characters with escape character.
+    while (*inptr != '\0') {
+        escptr = toesc;
+        while (*escptr != '\0') {
+            if (*inptr == *escptr) {
+                // Found it, skip the rest.
+                *retptr = escchr;
+                retptr++;
+                break;
+            }
+            escptr++;
+        }
+        *retptr = *inptr;
+        retptr++;
+        inptr++;
+    }
+    *retptr = '\0';
+
+    return retstr;
 }