X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=string.c;h=3bddd5e80896e843470687671a05cb0ef09051e2;hp=cefb45d674075cf1fcb2e42b42e5b0a929a52c16;hb=f7d3162fdf4c348beb7d315a85b34af6e1cdaff5;hpb=a5ad3d4c598bafe28e90e5b623e0a754d6e973d5

diff --git a/string.c b/string.c
index cefb45d6..3bddd5e8 100644
--- a/string.c
+++ b/string.c
@@ -711,6 +711,32 @@ out:
 	return ret;
 }
 
+/**
+ * Get the number of the word the cursor is on.
+ *
+ * \param buf The zero-terminated line buffer.
+ * \param delim Characters that separate words.
+ * \param point The cursor position.
+ *
+ * \return Zero-based word number.
+ */
+int compute_word_num(const char *buf, const char *delim, int point)
+{
+	int ret, num_words;
+	const char *p;
+	char *word;
+
+	for (p = buf, num_words = 0; ; p += ret, num_words++) {
+		ret = get_next_word(p, delim, &word);
+		if (ret <= 0)
+			break;
+		free(word);
+		if (p + ret >= buf + point)
+			break;
+	}
+	return num_words;
+}
+
 /**
  * Free an array of words created by create_argv().
  *
@@ -793,3 +819,56 @@ int para_regcomp(regex_t *preg, const char *regex, int cflags)
 	free(buf);
 	return -E_REGEX;
 }
+
+/**
+ * strdup() for not necessarily zero-terminated strings.
+ *
+ * \param src The source buffer.
+ * \param len The number of bytes to be copied.
+ *
+ * \return A 0-terminated buffer of length \a len + 1.
+ *
+ * This is similar to strndup(), which is a GNU extension. However, one
+ * difference is that strndup() returns \p NULL if insufficient memory was
+ * available while this function aborts in this case.
+ *
+ * \sa strdup(), \ref para_strdup().
+ */
+char *safe_strdup(const char *src, size_t len)
+{
+	char *p;
+
+	assert(len < (size_t)-1);
+	p = para_malloc(len + 1);
+	if (len > 0)
+		memcpy(p, src, len);
+	p[len] = '\0';
+	return p;
+}
+
+/**
+ * Copy the value of a key=value pair.
+ *
+ * This checks whether the given buffer starts with "key=", ignoring case. If
+ * yes, a copy of the value is returned. The source buffer may not be
+ * zero-terminated.
+ *
+ * \param src The source buffer.
+ * \param len The number of bytes of the tag.
+ * \param key Only copy if it is the value of this key.
+ *
+ * \return A zero-terminated buffer, or \p NULL if the key was
+ * not of the given type.
+ */
+char *key_value_copy(const char *src, size_t len, const char *key)
+{
+	int keylen = strlen(key);
+
+	if (len <= keylen)
+		return NULL;
+	if (strncasecmp(src, key, keylen))
+		return NULL;
+	if (src[keylen] != '=')
+		return NULL;
+	return safe_strdup(src + keylen + 1, len - keylen - 1);
+}