forked from noisytoot/rubyserv-iirc
74 lines
1.9 KiB
C
74 lines
1.9 KiB
C
// My string-related utils library for now
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//
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// Written by: Test_User <hax@andrewyu.org>
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//
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// This is free and unencumbered software released into the public
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// domain.
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//
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// Anyone is free to copy, modify, publish, use, compile, sell, or
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// distribute this software, either in source code form or as a compiled
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// binary, for any purpose, commercial or non-commercial, and by any
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// means.
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//
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// In jurisdictions that recognize copyright laws, the author or authors
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// of this software dedicate any and all copyright interest in the
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// software to the public domain. We make this dedication for the benefit
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// of the public at large and to the detriment of our heirs and
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// successors. We intend this dedication to be an overt act of
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// relinquishment in perpetuity of all present and future rights to this
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// software under copyright law.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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// IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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// OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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// OTHER DEALINGS IN THE SOFTWARE.
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#include <stdint.h>
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#include "types.h"
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uint64_t str_to_unsigned(struct string str, char *err) {
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if (str.len == 0) {
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*err = 1;
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return 0;
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}
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uint64_t val = 0;
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while (str.len > 0) {
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switch(str.data[0]) {
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9':
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if (val > ((uint64_t)-1)/10) {
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*err = 1;
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return 0;
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}
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val *= 10;
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if (val > (-((uint64_t)((uint8_t)str.data[0] - 0x30) + 1))) {
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*err = 1;
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return 0;
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}
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val += (uint8_t)str.data[0] - 0x30;
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break;
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default:
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*err = 1;
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return 0;
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}
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str.data++;
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str.len--;
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}
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*err = 0;
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return val;
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}
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