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// SPDX-License-Identifier: BSD-2-Clause-Patent
/*
* csv.c - CSV parser
*/
#include "shim.h"
void NONNULL(1, 3, 4)
parse_csv_line(char * line, size_t max, size_t *n_columns, const char *columns[])
{
char *next = line;
size_t n = 0, new_n = n;
const char * const delims = ",";
char state = 0;
char *token = NULL;
bool valid = true;
for (n = 0; n < *n_columns; n++) {
if (valid) {
valid = strntoken(next, max, delims, &token, &state);
}
if (valid) {
next += strlen(token) + 1;
max -= strlen(token) + 1;
columns[n] = token;
new_n = n + 1;
} else {
columns[n] = NULL;
continue;
}
}
*n_columns = new_n;
}
void
free_csv_list(list_t *list)
{
list_t *pos = NULL, *tmp = NULL;
list_for_each_safe(pos, tmp, list) {
struct csv_row *row;
row = list_entry(pos, struct csv_row, list);
list_del(&row->list);
FreePool(row);
}
}
EFI_STATUS
parse_csv_data(char *data, char *data_end, size_t n_columns, list_t *list)
{
EFI_STATUS efi_status = EFI_OUT_OF_RESOURCES;
char delims[] = "\r\n";
char *line = data;
size_t max = 0;
char *end = data_end;
if (!data || !end || end <= data || !n_columns || !list) {
dprint(L"data:0x%lx end:0x%lx n_columns:%lu list:0x%lx\n",
data, end, n_columns, list);
return EFI_INVALID_PARAMETER;
}
max = (uintptr_t)end - (uintptr_t)line + (end > line ? 1 : 0);
if (is_utf8_bom(line, max))
line += UTF8_BOM_SIZE;
while (line <= data_end && *line) {
size_t entrysz = sizeof(char *) * n_columns + sizeof(struct csv_row);
struct csv_row *entry;
size_t m_columns = n_columns;
char *delim;
bool found = true;
bool eof = false;
end = data_end;
max = (uintptr_t)end - (uintptr_t)line + (end > line ? 1 : 0);
/* Skip the delimiter(s) of the previous line */
while (max && found) {
found = false;
for (delim = &delims[0]; max && *delim; delim++) {
if (line[0] == *delim) {
line++;
max--;
found = true;
}
}
}
/* Find the first delimiter of the current line */
for (delim = &delims[0]; *delim; delim++) {
char *tmp = strnchrnul(line, max, *delim);
if (tmp < end)
end = tmp;
}
max = (uintptr_t)end - (uintptr_t)line + (end > line ? 1 : 0);
if (!*end)
eof = true;
*end = '\0';
if (line == data_end || max == 0) {
line = end + 1;
continue;
}
entry = AllocateZeroPool(entrysz);
if (!entry) {
efi_status = EFI_OUT_OF_RESOURCES;
goto err_oom;
}
INIT_LIST_HEAD(&entry->list);
list_add_tail(&entry->list, list);
for (delim = &delims[0]; *delim; delim++) {
char *tmp = strnchrnul((const char *)line, max, *delim);
if (tmp < end)
end = tmp;
}
parse_csv_line(line, max, &m_columns, (const char **)entry->columns);
entry->n_columns = m_columns;
if (eof)
break;
line = end + 1;
}
return EFI_SUCCESS;
err_oom:
free_csv_list(list);
return efi_status;
}
// vim:fenc=utf-8:tw=75:noet
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