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mirror of https://github.com/vlang/v.git synced 2023-08-10 21:13:21 +03:00

os.read_file(): replace C code with V, return ?string, handle errors

everywhere
This commit is contained in:
Alexander Medvednikov 2019-06-26 10:57:13 +02:00
parent b00a47be66
commit 8417fec5dc
3 changed files with 30 additions and 17 deletions

View File

@ -762,13 +762,19 @@ fn new_v(args[]string) *V {
// Location of all vlib files
mut lang_dir = ''
// First try fetching it from VROOT if it's defined
for { // TODO tmp hack for optionals
vroot_path := TmpPath + '/VROOT'
if os.file_exists(vroot_path) {
vroot := os.read_file(vroot_path).trim_space()
mut vroot := os.read_file(vroot_path) or {
break
}
vroot=vroot.trim_space()
if os.dir_exists(vroot) && os.dir_exists(vroot + '/builtin') {
lang_dir = vroot
}
}
break
}
// no "~/.vlang/VROOT" file, so the user must be running V for the first
// time.
if lang_dir == '' {

View File

@ -32,9 +32,13 @@ fn new_scanner(file_path string) *Scanner {
if !os.file_exists(file_path) {
panic('"$file_path" doesn\'t exist')
}
text := os.read_file(file_path) or {
panic('scanner: failed to open "$file_path"')
return &Scanner{}
}
scanner := &Scanner {
file_path: file_path
text: os.read_file(file_path)
text: text
fmt_out: new_string_builder(1000)
}
// println('new scanner "$file_path" txt.len=$scanner.text.len')

33
os/os.v
View File

@ -41,22 +41,25 @@ fn parse_windows_cmd_line(cmd byteptr) {
# os__args = vals;
}
fn C.ftell(fp voidptr) int
// read_file reads the file in `path` and returns the contents.
// TODO return `?string`
pub fn read_file(path string) string {
res := ''
# FILE *f = fopen(path.str, "r");
# if (!f) return tos("", 0);
# fseek(f, 0, SEEK_END);
# long fsize = ftell(f);
// # fseek(f, 0, SEEK_SET); //same as rewind(f);
# rewind(f);
# char *string = malloc(fsize + 1);
# fread(string, fsize, 1, f);
# fclose(f);
# string[fsize] = 0;
// # printf("RFILE= %s\n", string);
# res = tos(string, fsize);
pub fn read_file(path string) ?string {
mut res := ''
cpath := path.cstr()
fp := C.fopen(cpath, 'r')
if isnil(fp) {
return error('failed to open file "$path"')
}
C.fseek(fp, 0, SEEK_END)
fsize := C.ftell(fp)
// C.fseek(fp, 0, SEEK_SET) // same as C.rewind(fp) below
C.rewind(fp)
mut str := malloc(fsize + 1)
C.fread(str, fsize, 1, fp)
C.fclose(fp)
str[fsize] = 0
res = tos(str, fsize)
return res
}