2 files changed, 62 insertions, 10 deletions

diff --git a/src/string.c b/src/string.c
index 38d7824..2185a81 100644
--- a/src/string.c
+++ b/src/string.c
@@ -78,6 +78,45 @@ i32 strng_set(strng_t *string, char const *c) {
     return 0;
 }
 
+i32 strng_app(strng_t *dest, strng_t const *source) {
+    u64 slen = source->len;
+    u64 nlen = dest->len + slen;
+    if (nlen > dest->alloc_size) return -1;
+
+    char *dst = STRNG_TO(dest)+dest->len;
+    char const *src = STRNG_TO(source);
+    memcpy(dst, src, slen);
+
+    dest->len = nlen;
+    return nlen;
+}
+
+i32 strng_app_c(strng_t *dest, char const *source) {
+    u64 slen = strlen(source);
+    u64 nlen = dest->len + slen;
+    if (nlen > dest->alloc_size) return -1;
+
+    char *dst = STRNG_TO(dest)+dest->len;
+    char const *src = source;
+    memcpy(dst, src, slen);
+
+    dest->len = nlen;
+    return nlen;
+}
+
+i32 strng_app_v(strng_t *dest, strng_view_t const *source) {
+    u64 slen = source->end - source->start;
+    u64 nlen = dest->len + slen;
+    if (nlen > dest->alloc_size) return -1;
+
+    char *dst = STRNG_TO(dest)+dest->len;
+    char const *src = source->string+source->start;
+    memcpy(dst, src, slen);
+
+    dest->len = nlen;
+    return nlen;
+}
+
 void strng_clear(strng_t *string) {
     memset((u8*)string+STRNG_BASE_POS, 0, string->len);
     string->len = 0;
@@ -90,8 +129,14 @@ strng_view_t sv_from_chars(char const* c) { u64 l = strlen(c);
                                                 .max=l,
                                                 .string=c, }; }
 
-void  sv_trim_left(strng_view_t *sv) { while (sv->start<=  sv->end && isspace(*(sv->string+sv->start)) ) sv->start++; }
-void sv_trim_right(strng_view_t *sv) { while (sv->end  >=sv->start && isspace(*(  sv->string+sv->end)) )   sv->end--; }
+void  sv_trim_left(strng_view_t *sv) {
+    while (sv->start <= sv->end && isspace(*(sv->string+sv->start))) sv->start++;
+    if (sv->start > sv->end) sv->start = sv->end;
+}
+void sv_trim_right(strng_view_t *sv) {
+    while (sv->end >= sv->start && isspace(*(sv->string+sv->end))) sv->end--;
+    if (sv->end < sv->start) sv->end = sv->start;
+}
 void       sv_trim(strng_view_t *sv) { sv_trim_left(sv);
                                       sv_trim_right(sv); }
 
diff --git a/src/string.h b/src/string.h
index 999add8..a2e69c9 100644
--- a/src/string.h
+++ b/src/string.h
@@ -10,21 +10,28 @@ typedef struct {
     u64 len;
 } strng_t;
 
+typedef struct {
+       u64   start;
+       u64     end;
+       u64     max;
+char const *string;
+} strng_view_t;
+
 strng_t * strng_new(smrt_arena_t *arena, u64 size);
 strng_t *strng_from(smrt_arena_t *arena, char const *c);
 strng_t * strng_dup(smrt_arena_t *arena, strng_t const *src);
    char * strng_str(smrt_arena_t *arena, strng_t const *string);
     i32   strng_set(strng_t *string, char const *c);
+// Append to strng, returns -1 if no space, new len otherwise
+    i32   strng_app(strng_t *dest, strng_t const *source);
+// Append char* to strng, returns -1 if no space, new len otherwise
+    i32 strng_app_c(strng_t *dest, char const *source);
+// Append sv to strng, returns -1 if no space, new len otherwise
+    i32 strng_app_v(strng_t *dest, strng_view_t const *source);
    void strng_clear(strng_t *string);
 
-#define STRNG_FMT(s) (i32)s->len, (char *)((u8*)s+STRNG_BASE_POS)
-
-typedef struct {
-       u64   start;
-       u64     end;
-       u64     max;
-char const *string;
-} strng_view_t;
+#define STRNG_TO(s) (char *)((u8*)(s)+STRNG_BASE_POS)
+#define STRNG_FMT(s) (i32)s->len, (char *)((u8*)(s)+STRNG_BASE_POS)
 
 static inline strng_view_t sv_from(strng_t *string) {
     return (strng_view_t){