Parsing commandline arguments
This commit is contained in:
17
ulib/string/char.h
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17
ulib/string/char.h
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#ifndef ULIB_STRING_CHAR_H_
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#define ULIB_STRING_CHAR_H_
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#define string_chr_islower(c) ((c) >= 'a' && (c) <= 'z')
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#define string_chr_isupper(c) ((c) >= 'A' && (c) <= 'Z')
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#define string_chr_isalpha(c) (string_chr_islower((c)) || string_chr_isupper((c)))
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#define string_chr_isctl(c) (((c) >= 0 && (c) <= 0x1f) || (c) == 0x7f)
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#define string_chr_isdigit(c) ((c) >= '0' && (c) <= '9')
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#define string_chr_isalnum(c) (string_chr_isalpha((c)) || string_chr_isdigit((c)))
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#define string_chr_isprint(c) ((c) > 0x1f && (c) < 0x7f)
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#define string_chr_isspace(c) ((c) == ' ' || (c) == '\f' || (c) == '\t' || (c) == '\n' || (c) == '\r' || (c) == '\v')
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#define string_chr_tolower(c) (string_chr_isupper((c)) ? ((c) - 'A' + 'a') : (c))
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#define string_chr_toupper(c) (string_chr_islower((c)) ? ((c) - 'a' + 'A') : (c))
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#define string_chr_isascii(c) (!((c) < 0 || (c) > 0x7f))
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#define string_chr_isxdigit(c) (((c) >= '0' && (c) <= '9') || ((c) >= 'a' && (c) <= 'f') || ((c) >= 'A' && (c) <= 'F'))
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#endif // ULIB_STRING_CHAR_H_
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159
ulib/string/conv.c
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159
ulib/string/conv.c
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#include <stdint.h>
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#include <stddef.h>
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#include <machine/limits.h>
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#include <string/char.h>
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#include <uprintf.h>
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// https://android.googlesource.com/platform/bionic/+/ics-mr0/libc/stdlib/strtoul.c
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unsigned long string_conv_strtoul(const char *nptr, char **endptr, int base)
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{
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const char *s;
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unsigned long acc, cutoff;
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int c;
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int neg, any, cutlim;
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/*
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* See strtol for comments as to the logic used.
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*/
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s = nptr;
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do {
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c = (unsigned char) *s++;
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} while (string_chr_isspace(c));
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if (c == '-') {
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neg = 1;
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c = *s++;
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} else {
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neg = 0;
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if (c == '+')
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c = *s++;
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}
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if ((base == 0 || base == 16) &&
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c == '0' && (*s == 'x' || *s == 'X')) {
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c = s[1];
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s += 2;
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base = 16;
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}
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if (base == 0)
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base = c == '0' ? 8 : 10;
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cutoff = ULONG_MAX / (unsigned long)base;
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cutlim = ULONG_MAX % (unsigned long)base;
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for (acc = 0, any = 0;; c = (unsigned char) *s++) {
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if (string_chr_isdigit(c))
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c -= '0';
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else if (string_chr_isalpha(c))
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c -= string_chr_isupper(c) ? 'A' - 10 : 'a' - 10;
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else
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break;
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if (c >= base)
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break;
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if (any < 0)
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continue;
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if (acc > cutoff || (acc == cutoff && c > cutlim)) {
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any = -1;
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acc = ULONG_MAX;
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} else {
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any = 1;
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acc *= (unsigned long)base;
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acc += c;
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}
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}
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if (neg && any > 0)
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acc = -acc;
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if (endptr != 0)
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*endptr = (char *) (any ? s - 1 : nptr);
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return (acc);
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}
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// https://android.googlesource.com/platform/bionic/+/ics-mr0/libc/stdlib/strtol.c
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long string_conv_strtol(const char *nptr, char **endptr, int base)
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{
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const char *s;
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long acc, cutoff;
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int c;
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int neg, any, cutlim;
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/*
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* Skip white space and pick up leading +/- sign if any.
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* If base is 0, allow 0x for hex and 0 for octal, else
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* assume decimal; if base is already 16, allow 0x.
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*/
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s = nptr;
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do {
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c = (unsigned char) *s++;
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} while (string_chr_isspace(c));
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if (c == '-') {
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neg = 1;
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c = *s++;
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} else {
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neg = 0;
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if (c == '+')
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c = *s++;
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}
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if ((base == 0 || base == 16) &&
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c == '0' && (*s == 'x' || *s == 'X')) {
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c = s[1];
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s += 2;
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base = 16;
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}
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if (base == 0)
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base = c == '0' ? 8 : 10;
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/*
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* Compute the cutoff value between legal numbers and illegal
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* numbers. That is the largest legal value, divided by the
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* base. An input number that is greater than this value, if
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* followed by a legal input character, is too big. One that
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* is equal to this value may be valid or not; the limit
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* between valid and invalid numbers is then based on the last
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* digit. For instance, if the range for longs is
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* [-2147483648..2147483647] and the input base is 10,
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* cutoff will be set to 214748364 and cutlim to either
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* 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated
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* a value > 214748364, or equal but the next digit is > 7 (or 8),
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* the number is too big, and we will return a range error.
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*
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* Set any if any `digits' consumed; make it negative to indicate
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* overflow.
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*/
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cutoff = neg ? LONG_MIN : LONG_MAX;
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cutlim = cutoff % base;
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cutoff /= base;
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if (neg) {
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if (cutlim > 0) {
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cutlim -= base;
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cutoff += 1;
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}
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cutlim = -cutlim;
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}
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for (acc = 0, any = 0;; c = (unsigned char) *s++) {
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if (string_chr_isdigit(c))
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c -= '0';
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else if (string_chr_isalpha(c))
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c -= string_chr_isupper(c) ? 'A' - 10 : 'a' - 10;
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else
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break;
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if (c >= base)
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break;
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if (any < 0)
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continue;
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if (neg) {
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if (acc < cutoff || (acc == cutoff && c > cutlim)) {
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any = -1;
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acc = LONG_MIN;
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} else {
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any = 1;
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acc *= base;
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acc -= c;
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}
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} else {
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if (acc > cutoff || (acc == cutoff && c > cutlim)) {
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any = -1;
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acc = LONG_MAX;
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} else {
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any = 1;
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acc *= base;
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acc += c;
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}
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}
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}
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if (endptr != 0)
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*endptr = (char *) (any ? s - 1 : nptr);
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return (acc);
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}
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7
ulib/string/conv.h
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7
ulib/string/conv.h
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@ -0,0 +1,7 @@
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#ifndef ULIB_STRING_CONV_H_
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#define ULIB_STRING_CONV_H_
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unsigned long string_conv_strtoul(const char *nptr, char **endptr, int base);
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long string_conv_strtol(const char *nptr, char **endptr, int base);
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#endif // ULIB_STRING_CONV_H_
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@ -111,3 +111,22 @@ char *string_strchr(const char *s, int c) {
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}
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return NULL;
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}
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// https://stackoverflow.com/questions/32560167/strncmp-implementation
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int string_strncmp( const char * s1, const char * s2, size_t n )
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{
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while ( n && *s1 && ( *s1 == *s2 ) )
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{
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++s1;
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++s2;
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--n;
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}
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if ( n == 0 )
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{
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return 0;
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}
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else
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{
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return ( *(unsigned char *)s1 - *(unsigned char *)s2 );
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}
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}
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@ -6,9 +6,6 @@
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#include <stddef.h>
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#include <stdint.h>
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#define memset string_memset
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#define memcpy string_memcpy
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size_t string_len(const char *s);
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void *string_memset(void *p, int c, size_t n);
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void *string_memcpy(void *dst, const void *src, size_t n);
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@ -18,6 +15,7 @@ size_t string_strcspn(const char *s, const char *reject);
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size_t string_strspn(const char *s, const char *accept);
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char *string_strcpy(char *dest, const char *src);
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char *string_strchr(const char *s, int c);
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int string_strncmp(const char * s1, const char * s2, size_t n);
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#endif
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