add sarg_iter

gitgjogh · Jan 7, 2016 · b7b84e4 · b7b84e4
1 parent 2c5b5ca
commit b7b84e4
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diff --git a/libsim/sim_opt.c b/libsim/sim_opt.c
@@ -110,6 +110,55 @@ int ios_feof(ios_t *p, int ich)
     return feof((FILE*)p[ich].fp);
 }
 
+sarg_iter_t  sarg_iter_init(int argc, char **argv, int start)
+{
+    sarg_iter_t iter = { argv, argc, start };
+    return iter;
+}
+
+char*   sarg_get_ith(sarg_iter_t *iter, int i)
+{
+    if (iter->argv && i >= 0 && i < iter->argc) {
+        return iter->argv[i];
+    }
+    return 0;
+}
+
+char*   sarg_iter_1st (sarg_iter_t *iter)
+{
+    return sarg_get_ith(iter, iter->idx = iter->start);
+}
+
+char*   sarg_iter_next(sarg_iter_t *iter)
+{
+    return sarg_get_ith(iter, ++ iter->idx);
+}
+
+char*   sarg_iter_last(sarg_iter_t *iter)
+{
+    return sarg_get_ith(iter, iter->idx = iter->argc - 1);
+}
+
+char*   sarg_iter_prev(sarg_iter_t *iter)
+{
+    return sarg_get_ith(iter, -- iter->idx);
+}
+
+char*   sarg_iter_curr(sarg_iter_t *iter)
+{
+    return sarg_get_ith(iter, iter->idx);
+}
+
+char*   sarg_peek_next(sarg_iter_t *iter)
+{
+    return sarg_get_ith(iter, 1 + iter->idx);
+}
+
+char*   sarg_peek_ith (sarg_iter_t *iter, int ith)
+{
+    return sarg_get_ith(iter, ith + iter->idx);
+}
+
 char *get_argv(int argc, char *argv[], int i, const char *name)
 {
     int s = (argv && i<argc) ? argv[i][0] : 0;

diff --git a/libsim/sim_opt.h b/libsim/sim_opt.h
@@ -48,6 +48,24 @@ int     ios_close(ios_t *p, int nch);
 int     ios_feof(ios_t *p, int ich);
 
 
+typedef struct sarg_iter {
+    char**  argv;
+    int     argc;
+    int     start;
+    int     idx;
+} sarg_iter_t;
+
+sarg_iter_t  sarg_iter_init(int argc, char **argv, int start);
+char*   sarg_get_ith  (sarg_iter_t *iter, int ith);     /** argv[ith] */
+char*   sarg_iter_1st (sarg_iter_t *iter);
+char*   sarg_iter_next(sarg_iter_t *iter);
+char*   sarg_iter_last(sarg_iter_t *iter);
+char*   sarg_iter_prev(sarg_iter_t *iter);
+char*   sarg_iter_curr(sarg_iter_t *iter);              /** argv[iter->idx] */
+char*   sarg_peek_next(sarg_iter_t *iter);              /** argv[1 + iter->idx] */
+char*   sarg_peek_ith (sarg_iter_t *iter, int ith);     /** argv[ith + iter->idx] */
+
+
 #define GET_ARGV(idx, name) get_argv(argc, argv, idx, name);
 char*   get_argv(int argc, char *argv[], int i, const char *name);