d2fb8b4151
This patch modifies util/string.[ch] to add new function: perf_atoll() to parse string representing size in bytes. This function parses (\d+)(b|B|kb|KB|mb|MB|gb|GB) (e.g. "256MB") and returns its numeric value. (e.g. 268435456) Signed-off-by: Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <1258285013-4759-1-git-send-email-mitake@dcl.info.waseda.ac.jp> Signed-off-by: Ingo Molnar <mingo@elte.hu>
129 lines
1.9 KiB
C
129 lines
1.9 KiB
C
#include <string.h>
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#include <stdlib.h>
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#include "string.h"
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#include "util.h"
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static int hex(char ch)
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{
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if ((ch >= '0') && (ch <= '9'))
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return ch - '0';
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if ((ch >= 'a') && (ch <= 'f'))
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return ch - 'a' + 10;
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if ((ch >= 'A') && (ch <= 'F'))
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return ch - 'A' + 10;
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return -1;
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}
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/*
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* While we find nice hex chars, build a long_val.
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* Return number of chars processed.
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*/
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int hex2u64(const char *ptr, u64 *long_val)
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{
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const char *p = ptr;
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*long_val = 0;
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while (*p) {
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const int hex_val = hex(*p);
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if (hex_val < 0)
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break;
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*long_val = (*long_val << 4) | hex_val;
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p++;
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}
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return p - ptr;
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}
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char *strxfrchar(char *s, char from, char to)
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{
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char *p = s;
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while ((p = strchr(p, from)) != NULL)
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*p++ = to;
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return s;
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}
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#define K 1024LL
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/*
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* perf_atoll()
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* Parse (\d+)(b|B|kb|KB|mb|MB|gb|GB|tb|TB) (e.g. "256MB")
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* and return its numeric value
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*/
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s64 perf_atoll(const char *str)
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{
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unsigned int i;
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s64 length = -1, unit = 1;
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if (!isdigit(str[0]))
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goto out_err;
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for (i = 1; i < strlen(str); i++) {
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switch (str[i]) {
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case 'B':
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case 'b':
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break;
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case 'K':
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if (str[i + 1] != 'B')
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goto out_err;
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else
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goto kilo;
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case 'k':
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if (str[i + 1] != 'b')
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goto out_err;
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kilo:
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unit = K;
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break;
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case 'M':
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if (str[i + 1] != 'B')
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goto out_err;
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else
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goto mega;
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case 'm':
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if (str[i + 1] != 'b')
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goto out_err;
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mega:
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unit = K * K;
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break;
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case 'G':
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if (str[i + 1] != 'B')
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goto out_err;
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else
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goto giga;
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case 'g':
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if (str[i + 1] != 'b')
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goto out_err;
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giga:
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unit = K * K * K;
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break;
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case 'T':
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if (str[i + 1] != 'B')
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goto out_err;
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else
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goto tera;
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case 't':
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if (str[i + 1] != 'b')
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goto out_err;
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tera:
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unit = K * K * K * K;
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break;
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case '\0': /* only specified figures */
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unit = 1;
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break;
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default:
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if (!isdigit(str[i]))
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goto out_err;
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break;
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}
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}
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length = atoll(str) * unit;
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goto out;
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out_err:
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length = -1;
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out:
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return length;
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}
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