diff options
Diffstat (limited to 'app/bin/stringxtc.c')
| -rw-r--r-- | app/bin/stringxtc.c | 241 |
1 files changed, 140 insertions, 101 deletions
diff --git a/app/bin/stringxtc.c b/app/bin/stringxtc.c index 483f1a6..e65a97d 100644 --- a/app/bin/stringxtc.c +++ b/app/bin/stringxtc.c @@ -1,106 +1,145 @@ -/** \file stringxtc.c
- *
- * Copyright (C) 1991, 1992 Linus Torvalds
- */
-
- /*
- * stupid library routines.
- */
-
-#include <ctype.h>
-#include <stddef.h>
-#include <errno.h>
-#include "include/stringxtc.h"
-
-/**
- * strscpy - Copy a C-string into a sized buffer
- * @dest: Where to copy the string to
- * @src: Where to copy the string from
- * @count: Size of destination buffer
- *
- * Copy the string, or as much of it as fits, into the dest buffer. The
- * behavior is undefined if the string buffers overlap. The destination
- * buffer is always NUL terminated, unless it's zero-sized.
- *
- * Preferred to strlcpy() since the API doesn't require reading memory
- * from the src string beyond the specified "count" bytes, and since
- * the return value is easier to error-check than strlcpy()'s.
- * In addition, the implementation is robust to the string changing out
- * from underneath it, unlike the current strlcpy() implementation.
- *
- * Preferred to strncpy() since it always returns a valid string, and
- * doesn't unnecessarily force the tail of the destination buffer to be
- * zeroed. If zeroing is desired please use strscpy_pad().
- *
- * Return: The number of characters copied (not including the trailing
- * %NUL) or -E2BIG if the destination buffer wasn't big enough.
- */
-
-size_t strscpy(char *dest, const char *src, size_t count)
-{
- long res = 0;
-
- if (count == 0)
- return -E2BIG;
-
- while (count) {
- char c;
-
- c = src[res];
- dest[res] = c;
- if (!c)
- return res;
- res++;
- count--;
- }
-
- /* Hit buffer length without finding a NUL; force NUL-termination. */
- if (res)
- dest[res - 1] = '\0';
-
- return -E2BIG;
-}
-
-/**
- * Convert a string to lower case
- * Taken from https://stackoverflow.com/questions/23618316/undefined-reference-to-strlwr
- *
- * \param str IN string to convert
- * \return pointer to converted string
- */
-
-char *
-XtcStrlwr(char *str)
-{
- unsigned char *p = (unsigned char *)str;
-
- while (*p) {
- *p = tolower((unsigned char)*p);
- p++;
- }
-
- return str;
-}
-
-/**
- * Compare two strings case insensitive
- * Taken from https://stackoverflow.com/questions/30733786/c99-remove-stricmp-and-strnicmp
- *
- * \param a, b IN strings to compare
- * \return
- */
-
+/** \file stringxtc.c + * + * Copyright (C) 1991, 1992 Linus Torvalds + */ + +/* + * stupid library routines. + */ + +#include <ctype.h> +#include <stddef.h> +#include <errno.h> +#include <string.h> +#include "include/stringxtc.h" + +/** + * strscpy - Copy a C-string into a sized buffer + * @dest: Where to copy the string to + * @src: Where to copy the string from + * @count: Size of destination buffer + * + * Copy the string, or as much of it as fits, into the dest buffer. The + * behavior is undefined if the string buffers overlap. The destination + * buffer is always NUL terminated, unless it's zero-sized. + * + * Preferred to strlcpy() since the API doesn't require reading memory + * from the src string beyond the specified "count" bytes, and since + * the return value is easier to error-check than strlcpy()'s. + * In addition, the implementation is robust to the string changing out + * from underneath it, unlike the current strlcpy() implementation. + * + * Preferred to strncpy() since it always returns a valid string, and + * doesn't unnecessarily force the tail of the destination buffer to be + * zeroed. If zeroing is desired please use strscpy_pad(). + * + * Return: The number of characters copied (not including the trailing + * %NUL) or -E2BIG if the destination buffer wasn't big enough. + */ + +size_t strscpy(char *dest, const char *src, size_t count) +{ + long res = 0; + + if (count == 0) { + return -E2BIG; + } + + while (count) { + char c; + + c = src[res]; + dest[res] = c; + if (!c) { + return res; + } + res++; + count--; + } + + /* Hit buffer length without finding a NUL; force NUL-termination. */ + if (res) { + dest[res - 1] = '\0'; + } + + return -E2BIG; +} + +/* Safe version of strcat - will not overflow buffer + * Return: The number of characters in buffer (not including the trailing + * % NUL) or -E2BIG if the destination buffer wasn't big enough. + */ +size_t +strscat(char* dest, const char* src, size_t count) +{ + long sptr = 0; + long dptr = strlen(dest); + count -= dptr; + + if (count <= 0) { + return -E2BIG; + } + + while (count) { + char c; + + c = src[sptr]; + dest[dptr] = c; + if (!c) { + return dptr; + } + sptr++; + dptr++; + count--; + } + + /* Hit buffer length without finding a NUL; force NUL-termination. */ + if (dptr) { + dest[dptr - 1] = '\0'; + } + + return -E2BIG; +} + +/** + * Convert a string to lower case + * Taken from https://stackoverflow.com/questions/23618316/undefined-reference-to-strlwr + * + * \param str IN string to convert + * \return pointer to converted string + */ + +char * +XtcStrlwr(char *str) +{ + unsigned char *p = (unsigned char *)str; + + while (*p) { + *p = tolower((unsigned char)*p); + p++; + } + + return str; +} + +/** + * Compare two strings case insensitive + * Taken from https://stackoverflow.com/questions/30733786/c99-remove-stricmp-and-strnicmp + * + * \param a, b IN strings to compare + * \return + */ + int XtcStricmp(const char *a, const char *b) { - int ca, cb; - do { - ca = (unsigned char) *a++; - cb = (unsigned char) *b++; - ca = tolower(toupper(ca)); - cb = tolower(toupper(cb)); - } while ((ca == cb) && (ca != '\0')); - return ca - cb; + int ca, cb; + do { + ca = (unsigned char) *a++; + cb = (unsigned char) *b++; + ca = tolower(toupper(ca)); + cb = tolower(toupper(cb)); + } while ((ca == cb) && (ca != '\0')); + return ca - cb; } - |