jrk

commit 439f45490b55ce4424a9b0e4d034ddceb405adae
parent ef34e44bcb73003b7a7496f9da4bc687ff80e404
Author: Jake Koroman <jake@jakekoroman.com>
Date:   Thu, 31 Jul 2025 14:53:17 -0400

implement jrk_StringView.

Diffstat:
M
jrk.h
 | 
68
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-

1 file changed, 67 insertions(+), 1 deletion(-)
diff --git a/jrk.h b/jrk.h
@@ -30,6 +30,11 @@ typedef struct {
     u64 capacity;
 } jrk_StringBuilder;
 
+typedef struct {
+    char *data;
+    u64 count;
+} jrk_StringView;
+
 void *jrk_ecalloc(u64, u64);
 void *jrk_erealloc(void*, u64);
 
@@ -49,6 +54,11 @@ i32 jrk_sb_appendf(jrk_StringBuilder*, const char*, ...);
 void jrk_sb_fd_read_all(jrk_StringBuilder*, i32);
 u64 jrk_sb_fd_write_all(jrk_StringBuilder*, i32);
 
+jrk_StringView jrk_sv_from_parts(char*, u64);
+jrk_StringView jrk_sv_trim_right(jrk_StringView);
+jrk_StringView jrk_sv_trim_left(jrk_StringView);
+jrk_StringView jrk_sv_trim(jrk_StringView);
+
 /* NOTE(jake): no shortname as 'assert' is just too generic */
 #define jrk_assert(c, msg) do { if (!(c)) jrk_die("jrk_assert: "msg); } while(0)
 
@@ -58,6 +68,8 @@ u64 jrk_sb_fd_write_all(jrk_StringBuilder*, i32);
 #define jrk_arena_push_array(arena, type, n) (type *) jrk__arena_push(arena, sizeof(type) * n)
 #define jrk_arena_push_struct(arena, type) (type *) jrk__arena_push(arena, sizeof(type))
 
+#define jrk_sb_to_sv(sb) jrk_sv_from_parts((sb).items, (sb).count)
+
 #define jrk_da_reserve(da, expected_capacity)                                               \
     do {                                                                                    \
         if ((expected_capacity) > (da)->capacity) {                                         \
@@ -116,6 +128,7 @@ u64 jrk_sb_fd_write_all(jrk_StringBuilder*, i32);
 #ifdef JRK_SHORTNAMES
   #define Arena jrk_Arena
   #define StringBuilder jrk_StringBuilder
+  #define StringView jrk_StringView
 
   #define sb_appendf jrk_sb_appendf
   #define sb_append_null jrk_sb_append_null
@@ -124,6 +137,13 @@ u64 jrk_sb_fd_write_all(jrk_StringBuilder*, i32);
   #define sb_free jrk_sb_free
   #define sb_fd_read_all jrk_sb_fd_read_all
   #define sb_fd_write_all jrk_sb_fd_write_all
+  #define sb_to_sv jrk_sb_to_sv
+
+  #define sv_trim_left jrk_sv_trim_left
+  #define sv_trim_right jrk_sv_trim_right
+  #define sv_trim jrk_sv_trim
+  #define sv_from_cstr jrk_sv_from_cstr
+  #define sv_from_parts jrk_sv_from_parts
 
   #define ecalloc jrk_ecalloc
   #define erealloc jrk_erealloc
@@ -152,6 +172,7 @@ u64 jrk_sb_fd_write_all(jrk_StringBuilder*, i32);
 #endif // JRK_SHORTNAMES
 
 #ifdef JRK_IMPLEMENTATION
+#include <ctype.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <stdarg.h>
@@ -250,7 +271,9 @@ jrk_sb_fd_read_all(jrk_StringBuilder *sb, i32 fd)
 {
     u64 sz = jrk_fd_size(fd);
     jrk_da_reserve(sb, sz);
-    u64 n = read(fd, sb->items, sz);
+    if (read(fd, sb->items, sz) < 0)
+        jrk_edie("jrk_sb_fd_read_all");
+
     sb->count = sz;
 }
 
@@ -308,6 +331,49 @@ jrk_fd_open_write_append(char *path)
     return result;
 }
 
+jrk_StringView
+jrk_sv_from_parts(char *data, u64 count)
+{
+    jrk_StringView result = {0};
+    result.data = data;
+    if (data[count] == '\0')
+        result.count = count-1;
+    else
+        result.count = count;
+    return result;
+}
+
+jrk_StringView
+jrk_sv_from_cstr(char *data)
+{
+    jrk_StringView result = {0};
+    result.data = data;
+    result.count = strlen(data);
+    return result;
+}
+
+jrk_StringView
+jrk_sv_trim_right(jrk_StringView sv)
+{
+    u64 i = 0;
+    for (; i < sv.count && isspace(sv.data[sv.count - 1 - i]); ++i);
+    return jrk_sv_from_parts(sv.data, sv.count - i);
+}
+
+jrk_StringView
+jrk_sv_trim_left(jrk_StringView sv)
+{
+    u64 i = 0;
+    for (; i < sv.count && isspace(sv.data[i]); ++i);
+    return jrk_sv_from_parts(sv.data + i, sv.count - i);
+}
+
+jrk_StringView
+jrk_sv_trim(jrk_StringView sv)
+{
+    return jrk_sv_trim_right(jrk_sv_trim_left(sv));
+}
+
 i32
 jrk_rand_num(i32 upbound)
 {