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/* lib9p/9p.c - Base 9P protocol utilities for both clients and servers
*
* Copyright (C) 2024-2025 Luke T. Shumaker <lukeshu@lukeshu.com>
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
#include <inttypes.h> /* for PRIu{n} */
#include <stdarg.h> /* for va_* */
#include <string.h> /* for strncpy() */
#include <libfmt/fmt.h> /* for fmt_vsnprintf() */
#include <lib9p/9p.h>
/* strings ********************************************************************/
struct lib9p_s lib9p_str(char *s) {
if (!s)
return (struct lib9p_s){0};
return (struct lib9p_s){
.len = strlen(s),
.utf8 = s,
};
}
struct lib9p_s lib9p_strn(char *s, size_t maxlen) {
if (maxlen == 0 || !s)
return (struct lib9p_s){0};
return (struct lib9p_s){
.len = strnlen(s, maxlen),
.utf8 = s,
};
}
struct lib9p_s lib9p_str_slice(struct lib9p_s s, uint16_t beg, uint16_t end) {
assert(s.len == 0 || s.utf8);
assert(beg <= end && end <= s.len);
return (struct lib9p_s){
.len = end - beg,
.utf8 = &s.utf8[beg],
};
}
bool lib9p_str_eq(struct lib9p_s a, struct lib9p_s b) {
return a.len == b.len &&
(a.len == 0 || memcmp(a.utf8, b.utf8, a.len) == 0);
}
/* ctx ************************************************************************/
void lib9p_ctx_clear_error(struct lib9p_ctx *ctx) {
assert(ctx);
#if CONFIG_9P_ENABLE_9P2000_u
ctx->err_num = 0;
#endif
ctx->err_msg[0] = '\0';
}
bool lib9p_ctx_has_error(struct lib9p_ctx *ctx) {
assert(ctx);
return ctx->err_msg[0];
}
int lib9p_error(struct lib9p_ctx *ctx, lib9p_errno_t linux_errno, char const *msg) {
if (lib9p_ctx_has_error(ctx))
return -1;
strncpy(ctx->err_msg, msg, sizeof(ctx->err_msg));
ctx->err_msg[sizeof(ctx->err_msg)-1] = '\0';
#if CONFIG_9P_ENABLE_9P2000_u
ctx->err_num = linux_errno;
#else
(void)(linux_errno);
#endif
return -1;
}
int lib9p_errorf(struct lib9p_ctx *ctx, lib9p_errno_t linux_errno, char const *fmt, ...) {
int n;
va_list args;
if (lib9p_ctx_has_error(ctx))
return -1;
va_start(args, fmt);
n = fmt_vsnprintf(ctx->err_msg, sizeof(ctx->err_msg), fmt, args);
va_end(args);
if ((size_t)(n+1) < sizeof(ctx->err_msg))
memset(&ctx->err_msg[n+1], 0, sizeof(ctx->err_msg)-(n+1));
#if CONFIG_9P_ENABLE_9P2000_u
ctx->err_num = linux_errno;
#else
(void)(linux_errno);
#endif
return -1;
}
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