X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=lib%2Fdynamic-string.c;h=b648eef6549a28ab9c3c1b77e0f1beb1074ddcc3;hb=refs%2Fheads%2Fhotfix;hp=7e4843d1bbf069650bdf735155571e1e804188c2;hpb=34e63086edddcae06d7c1a4fa84fec0861e50758;p=sliver-openvswitch.git

diff --git a/lib/dynamic-string.c b/lib/dynamic-string.c
index 7e4843d1b..b648eef65 100644
--- a/lib/dynamic-string.c
+++ b/lib/dynamic-string.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008 Nicira Networks.
+ * Copyright (c) 2008, 2009, 2010, 2011, 2012 Nicira, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -23,6 +23,7 @@
 #include "timeval.h"
 #include "util.h"
 
+/* Initializes 'ds' as an empty string buffer. */
 void
 ds_init(struct ds *ds)
 {
@@ -31,12 +32,16 @@ ds_init(struct ds *ds)
     ds->allocated = 0;
 }
 
+/* Sets 'ds''s length to 0, effectively clearing any existing content.  Does
+ * not free any memory. */
 void
-ds_clear(struct ds *ds) 
+ds_clear(struct ds *ds)
 {
     ds->length = 0;
 }
 
+/* Reduces 'ds''s length to no more than 'new_length'.  (If its length is
+ * already 'new_length' or less, does nothing.)  */
 void
 ds_truncate(struct ds *ds, size_t new_length)
 {
@@ -46,6 +51,9 @@ ds_truncate(struct ds *ds, size_t new_length)
     }
 }
 
+/* Ensures that at least 'min_length + 1' bytes (including space for a null
+ * terminator) are allocated for ds->string, allocating or reallocating memory
+ * as necessary. */
 void
 ds_reserve(struct ds *ds, size_t min_length)
 {
@@ -56,6 +64,9 @@ ds_reserve(struct ds *ds, size_t min_length)
     }
 }
 
+/* Appends space for 'n' bytes to the end of 'ds->string', increasing
+ * 'ds->length' by the same amount, and returns the first appended byte.  The
+ * caller should fill in all 'n' bytes starting at the return value. */
 char *
 ds_put_uninit(struct ds *ds, size_t n)
 {
@@ -66,11 +77,36 @@ ds_put_uninit(struct ds *ds, size_t n)
 }
 
 void
-ds_put_char(struct ds *ds, char c)
+ds_put_char__(struct ds *ds, char c)
 {
     *ds_put_uninit(ds, 1) = c;
 }
 
+/* Appends unicode code point 'uc' to 'ds' in UTF-8 encoding. */
+void
+ds_put_utf8(struct ds *ds, int uc)
+{
+    if (uc <= 0x7f) {
+        ds_put_char(ds, uc);
+    } else if (uc <= 0x7ff) {
+        ds_put_char(ds, 0xc0 | (uc >> 6));
+        ds_put_char(ds, 0x80 | (uc & 0x3f));
+    } else if (uc <= 0xffff) {
+        ds_put_char(ds, 0xe0 | (uc >> 12));
+        ds_put_char(ds, 0x80 | ((uc >> 6) & 0x3f));
+        ds_put_char(ds, 0x80 | (uc & 0x3f));
+    } else if (uc <= 0x10ffff) {
+        ds_put_char(ds, 0xf0 | (uc >> 18));
+        ds_put_char(ds, 0x80 | ((uc >> 12) & 0x3f));
+        ds_put_char(ds, 0x80 | ((uc >> 6) & 0x3f));
+        ds_put_char(ds, 0x80 | (uc & 0x3f));
+    } else {
+        /* Invalid code point.  Insert the Unicode general substitute
+         * REPLACEMENT CHARACTER. */
+        ds_put_utf8(ds, 0xfffd);
+    }
+}
+
 void
 ds_put_char_multiple(struct ds *ds, char c, size_t n)
 {
@@ -90,6 +126,13 @@ ds_put_cstr(struct ds *ds, const char *s)
     memcpy(ds_put_uninit(ds, s_len), s, s_len);
 }
 
+void
+ds_put_and_free_cstr(struct ds *ds, char *s)
+{
+    ds_put_cstr(ds, s);
+    free(s);
+}
+
 void
 ds_put_format(struct ds *ds, const char *format, ...)
 {
@@ -115,8 +158,6 @@ ds_put_format_valist(struct ds *ds, const char *format, va_list args_)
     if (needed < available) {
         ds->length += needed;
     } else {
-        size_t available;
-
         ds_reserve(ds, ds->length + needed);
 
         va_copy(args, args_);
@@ -130,7 +171,7 @@ ds_put_format_valist(struct ds *ds, const char *format, va_list args_)
 }
 
 void
-ds_put_printable(struct ds *ds, const char *s, size_t n) 
+ds_put_printable(struct ds *ds, const char *s, size_t n)
 {
     ds_reserve(ds, ds->length + n);
     while (n-- > 0) {
@@ -143,13 +184,19 @@ ds_put_printable(struct ds *ds, const char *s, size_t n)
     }
 }
 
+/* Writes the current time to 'string' based on 'template'.
+ * The current time is either localtime or UTC based on 'utc'. */
 void
-ds_put_strftime(struct ds *ds, const char *template, const struct tm *tm)
+ds_put_strftime(struct ds *ds, const char *template, bool utc)
 {
-    if (!tm) {
-        time_t now = time_now();
+    const struct tm *tm;
+    time_t now = time_wall();
+    if (utc) {
+        tm = gmtime(&now);
+    } else {
         tm = localtime(&now);
     }
+
     for (;;) {
         size_t avail = ds->string ? ds->allocated - ds->length + 1 : 0;
         size_t used = strftime(&ds->string[ds->length], avail, template, tm);
@@ -157,7 +204,7 @@ ds_put_strftime(struct ds *ds, const char *template, const struct tm *tm)
             ds->length += used;
             return;
         }
-        ds_reserve(ds, ds->length + (avail < 32 ? 64 : 2 * avail)); 
+        ds_reserve(ds, ds->length + (avail < 32 ? 64 : 2 * avail));
     }
 }
 
@@ -177,6 +224,80 @@ ds_get_line(struct ds *ds, FILE *file)
     }
 }
 
+/* Reads a line from 'file' into 'ds', clearing anything initially in 'ds'.
+ * Deletes comments introduced by "#" and skips lines that contains only white
+ * space (after deleting comments).
+ *
+ * Returns 0 if successful, EOF if no non-blank line was found. */
+int
+ds_get_preprocessed_line(struct ds *ds, FILE *file)
+{
+    while (!ds_get_line(ds, file)) {
+        char *line = ds_cstr(ds);
+        char *comment;
+
+        /* Delete comments. */
+        comment = strchr(line, '#');
+        if (comment) {
+            *comment = '\0';
+        }
+
+        /* Return successfully unless the line is all spaces. */
+        if (line[strspn(line, " \t\n")] != '\0') {
+            return 0;
+        }
+    }
+    return EOF;
+}
+
+/* Reads a line from 'file' into 'ds' and does some preprocessing on it:
+ *
+ *    - If the line begins with #, prints it on stdout and reads the next line.
+ *
+ *    - Otherwise, if the line contains an # somewhere else, strips it and
+ *      everything following it (as a comment).
+ *
+ *    - If (after comment removal) the line contains only white space, prints
+ *      a blank line on stdout and reads the next line.
+ *
+ *    - Otherwise, returns the line to the caller.
+ *
+ * This is useful in some of the OVS tests, where we want to check that parsing
+ * and then re-formatting some kind of data does not change it, but we also
+ * want to be able to put comments in the input.
+ *
+ * Returns 0 if successful, EOF if no non-blank line was found. */
+int
+ds_get_test_line(struct ds *ds, FILE *file)
+{
+    for (;;) {
+        char *s, *comment;
+        int retval;
+
+        retval = ds_get_line(ds, file);
+        if (retval) {
+            return retval;
+        }
+
+        s = ds_cstr(ds);
+        if (*s == '#') {
+            puts(s);
+            continue;
+        }
+
+        comment = strchr(s, '#');
+        if (comment) {
+            *comment = '\0';
+        }
+        if (s[strspn(s, " \t\n")] == '\0') {
+            putchar('\n');
+            continue;
+        }
+
+        return 0;
+    }
+}
+
 char *
 ds_cstr(struct ds *ds)
 {
@@ -187,12 +308,38 @@ ds_cstr(struct ds *ds)
     return ds->string;
 }
 
+const char *
+ds_cstr_ro(const struct ds *ds)
+{
+    return ds_cstr(CONST_CAST(struct ds *, ds));
+}
+
+/* Returns a null-terminated string representing the current contents of 'ds',
+ * which the caller is expected to free with free(), then clears the contents
+ * of 'ds'. */
+char *
+ds_steal_cstr(struct ds *ds)
+{
+    char *s = ds_cstr(ds);
+    ds_init(ds);
+    return s;
+}
+
 void
 ds_destroy(struct ds *ds)
 {
     free(ds->string);
 }
 
+/* Swaps the content of 'a' and 'b'. */
+void
+ds_swap(struct ds *a, struct ds *b)
+{
+    struct ds temp = *a;
+    *a = *b;
+    *b = temp;
+}
+
 /* Writes the 'size' bytes in 'buf' to 'string' as hex bytes arranged 16 per
  * line.  Numeric offsets are also included, starting at 'ofs' for the first
  * byte in 'buf'.  If 'ascii' is true then the corresponding ASCII characters