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Introduce read_remainder_of_file

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This patch adds a new function, read_remainder_of_file.  This is like
read_text_file_to_string, but reads from an existing 'FILE *'.  This
will be used in a subsequent patch.

Reviewed-By: Tom de Vries <tdevries@suse.de>
This commit is contained in:
Tom Tromey 2024-02-15 12:12:25 -07:00
parent 50c6682d74
commit 5c92d8456d
2 changed files with 20 additions and 8 deletions
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24
gdbsupport/filestuff.cc
View File

@ -504,13 +504,9 @@ mkdir_recursive (const char *dir)
/* See gdbsupport/filestuff.h. */
std::optional<std::string>
read_text_file_to_string (const char *path)
std::string
read_remainder_of_file (FILE *file)
{
gdb_file_up file = gdb_fopen_cloexec (path, "r");
if (file == nullptr)
return {};
std::string res;
for (;;)
{
@ -520,7 +516,7 @@ read_text_file_to_string (const char *path)
/* Resize to accommodate CHUNK_SIZE bytes. */
res.resize (start_size + chunk_size);
int n = fread (&res[start_size], 1, chunk_size, file.get ());
int n = fread (&res[start_size], 1, chunk_size, file);
if (n == chunk_size)
continue;
@ -528,7 +524,7 @@ read_text_file_to_string (const char *path)
/* Less than CHUNK means EOF or error. If it's an error, return
no value. */
if (ferror (file.get ()))
if (ferror (file))
return {};
/* Resize the string according to the data we read. */
@ -538,3 +534,15 @@ read_text_file_to_string (const char *path)
return res;
}
/* See gdbsupport/filestuff.h. */
std::optional<std::string>
read_text_file_to_string (const char *path)
{
gdb_file_up file = gdb_fopen_cloexec (path, "r");
if (file == nullptr)
return {};
return read_remainder_of_file (file.get ());
}

4
gdbsupport/filestuff.h
View File

@ -133,4 +133,8 @@ extern bool mkdir_recursive (const char *dir);
extern std::optional<std::string> read_text_file_to_string (const char *path);
/* Read the remaining content from FILE into an std::string. */
extern std::string read_remainder_of_file (FILE *file);
#endif /* COMMON_FILESTUFF_H */