Import notmuch_0.28.2.orig.tar.gz

[dgit import orig notmuch_0.28.2.orig.tar.gz]

1 files changed, 270 insertions, 0 deletions

diff --git a/util/string-util.c b/util/string-util.c
new file mode 100644
index 00000000..fc2058e0
--- /dev/null
+++ b/util/string-util.c
@@ -0,0 +1,270 @@
+/* string-util.c -  Extra or enhanced routines for null terminated strings.
+ *
+ * Copyright (c) 2012 Jani Nikula
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see https://www.gnu.org/licenses/ .
+ *
+ * Author: Jani Nikula <jani@nikula.org>
+ */
+
+
+#include "string-util.h"
+#include "talloc.h"
+
+#include <ctype.h>
+#include <errno.h>
+
+char *
+strtok_len (char *s, const char *delim, size_t *len)
+{
+    /* skip initial delims */
+    s += strspn (s, delim);
+
+    /* length of token */
+    *len = strcspn (s, delim);
+
+    return *len ? s : NULL;
+}
+
+const char *
+strtok_len_c (const char *s, const char *delim, size_t *len)
+{
+    /* strtok_len is already const-safe, but we can't express both
+     * versions in the C type system. */
+    return strtok_len ((char*)s, delim, len);
+}
+
+char *
+sanitize_string (const void *ctx, const char *str)
+{
+    char *out, *loop;
+
+    if (! str)
+	return NULL;
+
+    out = talloc_strdup (ctx, str);
+    if (! out)
+	return NULL;
+
+    for (loop = out; *loop; loop++) {
+	if (*loop == '\t' || *loop == '\n')
+	    *loop = ' ';
+	else if ((unsigned char)(*loop) < 32)
+	    *loop = '?';
+    }
+
+    return out;
+}
+
+static int
+is_unquoted_terminator (unsigned char c)
+{
+    return c == 0 || c <= ' ' || c == ')';
+}
+
+int
+make_boolean_term (void *ctx, const char *prefix, const char *term,
+		   char **buf, size_t *len)
+{
+    const char *in;
+    char *out;
+    size_t needed = 3;
+    int need_quoting = 0;
+
+    /* Do we need quoting?  To be paranoid, we quote anything
+     * containing a quote or '(', even though these only matter at the
+     * beginning, and anything containing non-ASCII text. */
+    if (! term[0])
+	need_quoting = 1;
+    for (in = term; *in && !need_quoting; in++)
+	if (is_unquoted_terminator (*in) || *in == '"' || *in == '('
+	    || (unsigned char)*in > 127)
+	    need_quoting = 1;
+
+    if (need_quoting)
+	for (in = term; *in; in++)
+	    needed += (*in == '"') ? 2 : 1;
+    else
+	needed = strlen (term) + 1;
+
+    /* Reserve space for the prefix */
+    if (prefix)
+	needed += strlen (prefix) + 1;
+
+    if ((*buf == NULL) || (needed > *len)) {
+	*len = 2 * needed;
+	*buf = talloc_realloc (ctx, *buf, char, *len);
+    }
+
+    if (! *buf) {
+	errno = ENOMEM;
+	return -1;
+    }
+
+    out = *buf;
+
+    /* Copy in the prefix */
+    if (prefix) {
+	strcpy (out, prefix);
+	out += strlen (prefix);
+	*out++ = ':';
+    }
+
+    if (! need_quoting) {
+	strcpy (out, term);
+	return 0;
+    }
+
+    /* Quote term by enclosing it in double quotes and doubling any
+     * internal double quotes. */
+    *out++ = '"';
+    in = term;
+    while (*in) {
+	if (*in == '"')
+	    *out++ = '"';
+	*out++ = *in++;
+    }
+    *out++ = '"';
+    *out = '\0';
+
+    return 0;
+}
+
+const char*
+skip_space (const char *str)
+{
+    while (*str && isspace ((unsigned char) *str))
+	++str;
+    return str;
+}
+
+int
+parse_boolean_term (void *ctx, const char *str,
+		    char **prefix_out, char **term_out)
+{
+    int err = EINVAL;
+    *prefix_out = *term_out = NULL;
+
+    /* Parse prefix */
+    str = skip_space (str);
+    const char *pos = strchr (str, ':');
+    if (! pos || pos == str)
+	goto FAIL;
+    *prefix_out = talloc_strndup (ctx, str, pos - str);
+    if (! *prefix_out) {
+	err = ENOMEM;
+	goto FAIL;
+    }
+    ++pos;
+
+    /* Implement de-quoting compatible with make_boolean_term. */
+    if (*pos == '"') {
+	char *out = talloc_array (ctx, char, strlen (pos));
+	int closed = 0;
+	if (! out) {
+	    err = ENOMEM;
+	    goto FAIL;
+	}
+	*term_out = out;
+	/* Skip the opening quote, find the closing quote, and
+	 * un-double doubled internal quotes. */
+	for (++pos; *pos; ) {
+	    if (*pos == '"') {
+		++pos;
+		if (*pos != '"') {
+		    /* Found the closing quote. */
+		    closed = 1;
+		    pos = skip_space (pos);
+		    break;
+		}
+	    }
+	    *out++ = *pos++;
+	}
+	/* Did the term terminate without a closing quote or is there
+	 * trailing text after the closing quote? */
+	if (!closed || *pos)
+	    goto FAIL;
+	*out = '\0';
+    } else {
+	const char *start = pos;
+	/* Check for text after the boolean term. */
+	while (! is_unquoted_terminator (*pos))
+	    ++pos;
+	if (*skip_space (pos)) {
+	    err = EINVAL;
+	    goto FAIL;
+	}
+	/* No trailing text; dup the string so the caller can free
+	 * it. */
+	*term_out = talloc_strndup (ctx, start, pos - start);
+	if (! *term_out) {
+	    err = ENOMEM;
+	    goto FAIL;
+	}
+    }
+    return 0;
+
+ FAIL:
+    talloc_free (*prefix_out);
+    talloc_free (*term_out);
+    errno = err;
+    return -1;
+}
+
+int
+strcmp_null (const char *s1, const char *s2)
+{
+    if (s1 && s2)
+	return strcmp (s1, s2);
+    else if (! s1 && ! s2)
+	return 0;
+    else if (s1)
+	return 1;	/* s1 (non-NULL) is greater than s2 (NULL) */
+    else
+	return -1;	/* s1 (NULL) is less than s2 (non-NULL) */
+}
+
+int
+strcase_equal (const void *a, const void *b)
+{
+    return strcasecmp (a, b) == 0;
+}
+
+unsigned int
+strcase_hash (const void *ptr)
+{
+    const char *s = ptr;
+
+    /* This is the djb2 hash. */
+    unsigned int hash = 5381;
+    while (s && *s) {
+	hash = ((hash << 5) + hash) + tolower (*s);
+	s++;
+    }
+
+    return hash;
+}
+
+void
+strip_trailing (char *str, char ch)
+{
+    int i;
+
+    for (i = strlen (str) - 1; i >= 0; i--) {
+	if (str[i] == ch)
+	    str[i] = '\0';
+	else
+	    break;
+    }
+}