procps 010114

ps/escape.c

@@ -0,0 +1,106 @@
+/*
+ * Copyright 1998 by Albert Cahalan; all rights resered.         
+ * This file may be used subject to the terms and conditions of the
+ * GNU Library General Public License Version 2, or any later version  
+ * at your option, as published by the Free Software Foundation.
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Library General Public License for more details.
+ */                                 
+#include <sys/types.h>
+
+/* sanitize a string, without the nice BSD library function:     */
+/* strvis(vis_args, k->ki_args, VIS_TAB | VIS_NL | VIS_NOSLASH)  */
+int octal_escape_str(char *dst, const char *src, size_t n){
+  unsigned char c;
+  char d;
+  size_t i;
+  const char *codes =
+  "Z------abtnvfr-------------e----"
+  " *******************************"  /* better: do not print any space */
+  "****************************\\***"
+  "*******************************-"
+  "--------------------------------"
+  "********************************"
+  "********************************"
+  "********************************";
+  for(i=0; i<n;){
+    c = (unsigned char) *(src++);
+    d = codes[c];
+    switch(d){
+    case 'Z':
+      goto leave;
+    case '*':
+      i++;
+      *(dst++) = c;
+      break;
+    case '-':
+      if(i+4 > n) goto leave;
+      i += 4;
+      *(dst++) = '\\';
+      *(dst++) = "01234567"[c>>6];
+      *(dst++) = "01234567"[(c>>3)&07];
+      *(dst++) = "01234567"[c&07];
+      break;
+    default:
+      if(i+2 > n) goto leave;
+      i += 2;
+      *(dst++) = '\\';
+      *(dst++) = d;
+      break;
+    }
+  }
+leave:
+  *(dst++) = '\0';
+  return i;
+}
+
+/* sanitize a string via one-way mangle */
+int simple_escape_str(char *dst, const char *src, size_t n){
+  unsigned char c;
+  size_t i;
+  const char *codes =
+  "Z-------------------------------"
+  "********************************"
+  "********************************"
+  "*******************************-"
+  "--------------------------------"
+  "********************************"
+  "********************************"
+  "********************************";
+  for(i=0; i<n;){
+    c = (unsigned char) *(src++);
+    switch(codes[c]){
+    case 'Z':
+      goto leave;
+    case '*':
+      i++;
+      *(dst++) = c;
+      break;
+    case '-':
+      i++;
+      *(dst++) = '?';
+      break;
+    }
+  }
+leave:
+  *(dst++) = '\0';
+  return i;
+}
+
+/* escape a string as desired */
+int escape_str(char *dst, const char *src, size_t n){
+  return simple_escape_str(dst, src, n);
+}
+
+/* escape an argv or environment string array */
+int escape_strlist(char *dst, const char **src, size_t n){
+  size_t i = 0;
+  while(*src){
+    i += simple_escape_str(dst+i, *src, n-i);
+    if((n-i > 1) && (*(src+1))) dst[i++] = ' ';
+    src++;
+  }
+  return i;
+}