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https://codeberg.org/libreboot/lbmk.git
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f2544d094b
part of the same code library as nvmutil. as part of this, i renamed util/nvmutil to util/libreboot-utils/ because it is now a multi-utility codebase. this is more efficient, since i also wish to use mkhtemp (function) in nvmutil. Signed-off-by: Leah Rowe <leah@libreboot.org>
147 lines
2.4 KiB
C
147 lines
2.4 KiB
C
/* SPDX-License-Identifier: MIT
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* Copyright (c) 2026 Leah Rowe <leah@libreboot.org>
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*
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* String functions
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <stdarg.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "../include/common.h"
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/* scmp() - strict string comparison
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*
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* strict string comparison
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* similar to strncmp, but null and
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* unterminated inputs do not produce
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* a return value; on error, errno is
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* set and -1 is returned.
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*
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* the real return value is stored in
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* the 4th argument by pointer.
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*
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* the value at rval pointer is set,
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* only upon success. callers should
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* check the return value accordingly.
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*/
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int
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scmp(const char *a,
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const char *b,
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size_t maxlen,
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int *rval)
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{
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size_t ch;
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unsigned char ac;
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unsigned char bc;
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if (a == NULL ||
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b == NULL ||
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rval == NULL) {
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errno = EFAULT;
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return -1;
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}
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for (ch = 0; ch < maxlen; ch++) {
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ac = (unsigned char)a[ch];
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bc = (unsigned char)b[ch];
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if (ac != bc) {
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*rval = ac - bc;
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return 0;
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}
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if (ac == '\0') {
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*rval = 0;
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return 0;
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}
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}
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/* block unterminated strings */
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errno = EFAULT;
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return -1;
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}
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/* slen() - strict strict length
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*
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* strict string length calculation
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* similar to strnlen, but null and
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* unterminated inputs do not produce
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* a return value; on error, errno is
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* set and -1 is returned.
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*
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* the real return value is stored in
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* the 3rd argument by pointer.
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*
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* the value at rval pointer is set,
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* only upon success. callers should
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* check the return value accordingly.
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*/
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int
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slen(const char *s,
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size_t maxlen,
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size_t *rval)
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{
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size_t ch;
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if (s == NULL ||
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rval == NULL) {
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errno = EFAULT;
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return -1;
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}
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for (ch = 0;
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ch < maxlen && s[ch] != '\0';
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ch++);
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if (ch == maxlen) {
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/* unterminated */
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errno = EFAULT;
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return -1;
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}
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*rval = ch;
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return 0;
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}
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/* the one for nvmutil state is in state.c */
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/* this one just exits */
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void
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err_no_cleanup(int nvm_errval, const char *msg, ...)
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{
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va_list args;
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#if defined(__OpenBSD__) && defined(OpenBSD)
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#if (OpenBSD) >= 509
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if (pledge("stdio", NULL) == -1)
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fprintf(stderr, "pledge failure during exit");
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#endif
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#endif
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if (!errno)
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errno = ECANCELED;
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fprintf(stderr, "nvmutil: ");
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va_start(args, msg);
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vfprintf(stderr, msg, args);
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va_end(args);
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fprintf(stderr, ": %s\n", strerror(errno));
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exit(EXIT_FAILURE);
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}
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