MINOR: samples: adds the field converter.
field(<index>,<delimiters>)
Extracts the substring at the given index considering given delimiters from
an input string. Indexes start at 1 and delimiters are a string formatted
list of chars.
diff --git a/src/sample.c b/src/sample.c
index 02e3961..9837f0c 100644
--- a/src/sample.c
+++ b/src/sample.c
@@ -1583,6 +1583,92 @@
return 1;
}
+static int sample_conv_field_check(struct arg *args, struct sample_conv *conv,
+ const char *file, int line, char **err)
+{
+ struct arg *arg = args;
+
+ if (!arg) {
+ memprintf(err, "Unexpected empty arg list");
+ return 0;
+ }
+
+ if (arg->type != ARGT_UINT) {
+ memprintf(err, "Unexpected arg type");
+ return 0;
+ }
+
+ if (!arg->data.uint) {
+ memprintf(err, "Unexpected value 0 for index");
+ return 0;
+ }
+
+ arg++;
+
+ if (arg->type != ARGT_STR) {
+ memprintf(err, "Unexpected arg type");
+ return 0;
+ }
+
+ if (!arg->data.str.len) {
+ memprintf(err, "Empty separators list");
+ return 0;
+ }
+
+ return 1;
+}
+
+/* This sample function is designed to a return selected part of a string (field).
+ * First arg is the index of the field (start at 1)
+ * Second arg is a char list of separators (type string)
+ */
+static int sample_conv_field(const struct arg *arg_p, struct sample *smp)
+{
+ unsigned int field;
+ char *start, *end;
+ int i;
+
+ if (!arg_p[0].data.uint)
+ return 0;
+
+ field = 1;
+ end = start = smp->data.str.str;
+ while (end - smp->data.str.str < smp->data.str.len) {
+
+ for (i = 0 ; i < arg_p[1].data.str.len ; i++) {
+ if (*end == arg_p[1].data.str.str[i]) {
+ if (field == arg_p[0].data.uint)
+ goto found;
+ start = end+1;
+ field++;
+ break;
+ }
+ }
+ end++;
+ }
+
+ /* Field not found */
+ if (field != arg_p[0].data.uint) {
+ smp->data.str.len = 0;
+ return 1;
+ }
+found:
+ smp->data.str.len = end - start;
+ /* If ret string is len 0, no need to
+ change pointers or to update size */
+ if (!smp->data.str.len)
+ return 1;
+
+ smp->data.str.str = start;
+
+ /* Compute remaining size if needed
+ Note: smp->data.str.size cannot be set to 0 */
+ if (smp->data.str.size)
+ smp->data.str.size -= start - smp->data.str.str;
+
+ return 1;
+}
+
/************************************************************************/
/* All supported sample fetch functions must be declared here */
/************************************************************************/
@@ -1725,6 +1811,7 @@
{ "wt6", sample_conv_wt6, ARG1(0,UINT), NULL, SMP_T_BIN, SMP_T_UINT },
{ "json", sample_conv_json, ARG1(1,STR), sample_conv_json_check, SMP_T_STR, SMP_T_STR },
{ "bytes", sample_conv_bytes, ARG2(1,UINT,UINT), NULL, SMP_T_BIN, SMP_T_BIN },
+ { "field", sample_conv_field, ARG2(2,UINT,STR), sample_conv_field_check, SMP_T_STR, SMP_T_STR },
{ NULL, NULL, 0, 0, 0 },
}};