MINOR: tools: add new functions to quote-encode strings
qstr() and cstr() will be used to quote-encode strings. The first one
does it unconditionally. The second one is aimed at CSV files where the
quote-encoding is only needed when the field contains a quote or a comma.
diff --git a/src/standard.c b/src/standard.c
index b0c5fe6..f57724c 100644
--- a/src/standard.c
+++ b/src/standard.c
@@ -38,6 +38,12 @@
char itoa_str[NB_ITOA_STR][171];
int itoa_idx = 0; /* index of next itoa_str to use */
+/* sometimes we'll need to quote strings (eg: in stats), and we don't expect
+ * to quote strings larger than a max configuration line.
+ */
+char quoted_str[NB_QSTR][QSTR_SIZE + 1];
+int quoted_idx = 0;
+
/*
* unsigned long long ASCII representation
*
@@ -444,6 +450,39 @@
return (n) ? ultoa_r(n, buffer, size) : (alt ? alt : "");
}
+/* returns a locally allocated string containing the quoted encoding of the
+ * input string. The output may be truncated to QSTR_SIZE chars, but it is
+ * guaranteed that the string will always be properly terminated. Quotes are
+ * encoded by doubling them as is commonly done in CSV files. QSTR_SIZE must
+ * always be at least 4 chars.
+ */
+const char *qstr(const char *str)
+{
+ char *ret = quoted_str[quoted_idx];
+ char *p, *end;
+
+ if (++quoted_idx >= NB_QSTR)
+ quoted_idx = 0;
+
+ p = ret;
+ end = ret + QSTR_SIZE;
+
+ *p++ = '"';
+
+ /* always keep 3 chars to support passing "" and the ending " */
+ while (*str && p < end - 3) {
+ if (*str == '"') {
+ *p++ = '"';
+ *p++ = '"';
+ }
+ else
+ *p++ = *str;
+ str++;
+ }
+ *p++ = '"';
+ return ret;
+}
+
/*
* Returns non-zero if character <s> is a hex digit (0-9, a-f, A-F), else zero.
*