MINOR: sample: add ltrim converter

This converter strips specified characters from the beginning of a string.

diff --git a/doc/configuration.txt b/doc/configuration.txt
index df4465cafe012209033b844fa0cde8c954953196..c8e9cbc465715ec413652dab530e110ab64be05d 100644 (file)
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -14249,6 +14249,10 @@ ltime(<format>[,<offset>])
       # e.g.  20140710162350 127.0.0.1:57325
       log-format %[date,ltime(%Y%m%d%H%M%S)]\ %ci:%cp
 
+ltrim(<chars>)
+  Skips any characters from <chars> from the beginning of the string
+  representation of the input sample.
+
 map(<map_file>[,<default_value>])
 map_<match_type>(<map_file>[,<default_value>])
 map_<match_type>_<output_type>(<map_file>[,<default_value>])

diff --git a/src/sample.c b/src/sample.c
index 43d932d84961516c317e6090c19a04d17ed344cb..fbbdab1af1b58a4b2c121c8760f8304f39597248 100644 (file)
--- a/src/sample.c
+++ b/src/sample.c
@@ -2994,6 +2994,27 @@ static int sample_conv_cut_crlf(const struct arg *arg_p, struct sample *smp, voi
        return 1;
 }
 
+/**/
+static int sample_conv_ltrim(const struct arg *arg_p, struct sample *smp, void *private)
+{
+       char *delimiters, *p;
+       size_t dlen, l;
+
+       delimiters =  arg_p[0].data.str.area;
+       dlen = arg_p[0].data.str.data;
+
+       l = smp->data.u.str.data;
+       p = smp->data.u.str.area;
+       while (l && memchr(delimiters, *p, dlen) != NULL) {
+               p++;
+               l--;
+       }
+
+       smp->data.u.str.area = p;
+       smp->data.u.str.data = l;
+       return 1;
+}
+
 /************************************************************************/
 /*       All supported sample fetch functions must be declared here     */
 /************************************************************************/
@@ -3464,6 +3485,7 @@ static struct sample_conv_kw_list sample_conv_kws = {ILH, {
 
        { "htonl",    sample_conv_htonl,              0, NULL, SMP_T_SINT, SMP_T_BIN  },
        { "cut_crlf", sample_conv_cut_crlf,           0, NULL, SMP_T_STR,  SMP_T_STR  },
+       { "ltrim",    sample_conv_ltrim,    ARG1(1,STR), NULL, SMP_T_STR,  SMP_T_STR  },
        { NULL, NULL, 0, 0, 0 },
 }};