134 lines
3.9 KiB
C
134 lines
3.9 KiB
C
#include <unistd.h>
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#include <stdint.h>
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#include <string.h>
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#include <unistd.h>
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static int begins_with(char * str, char * prefix)
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{
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while(*prefix) {
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if(*str == '\0') return 0;
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if(*str != *prefix) return 0;
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str++;
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prefix++;
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}
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return 1;
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}
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char * pr_u32(int32_t input) {
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static char buf[9];
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const char *digits = "0123456789abcdef";
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int i=0;
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buf[i] = digits[(input & 0xf0000000) >> 28];
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buf[i+1] = digits[(input & 0x0f000000) >> 24];
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if(buf[i] != '0' || buf[i+1] != '0') i+=2;
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buf[i] = digits[(input & 0x00f00000) >> 20];
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buf[i+1] = digits[(input & 0x000f0000) >> 16];
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if(buf[i] != '0' || buf[i+1] != '0') i+=2;
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buf[i] = digits[(input & 0x0000f000) >> 12];
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buf[i+1] = digits[(input & 0x00000f00) >> 8];
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if(buf[i] != '0' || buf[i+1] != '0') i+=2;
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buf[i] = digits[(input & 0x000000f0) >> 4];
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buf[i+1] = digits[(input & 0x0000000f)];
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i+=2;
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buf[i] ='\0';
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if(write(2, buf, i))
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return buf;
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else
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return NULL;
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}
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void parseopts(char * cmdline, char **root, char **rootfstype) {
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*root = 0;
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*rootfstype = 0;
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for(char *p = cmdline; *p; p++) {
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if(begins_with(p, "root=")) {
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*root = p + strlen("root=");
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while(*p && (*p != ' ')) p++;
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if(*p) {
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*p = '\0';
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p++;
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};
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};
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if(begins_with(p, "rootfstype=")) {
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*rootfstype = p + strlen("rootfstype=");
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while(*p && (*p != ' ')) p++;
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if(*p) {
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*p = '\0';
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p++;
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};
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};
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};
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}
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#ifdef TESTS
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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// cc -DTESTS -o parseopts parseopts.c && ./parseopts
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#define die(fmt, ...) do { printf(fmt, __VA_ARGS__); exit(1); } while(0)
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#define S(x) #x
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#define expect_equal(actual, expected) \
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if(!actual || strcmp(actual, expected)) die("%d: expected \"%s\", got \"%s\"", __LINE__, expected, actual);
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int main()
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{
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char * root = "/dev/hda1";
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char * rootfstype = "xiafs";
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char *buf;
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// finds root= and rootfstype= options
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buf = strdup("liminix console=ttyS0,115200 panic=10 oops=panic init=/bin/init loglevel=8 root=/dev/ubi0_4 rootfstype=ubifs fw_devlink=off mtdparts=phram0:18M(rootfs) phram.phram=phram0,0x40400000,18874368,65536 root=/dev/mtdblock0 foo");
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parseopts(buf, &root, &rootfstype);
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expect_equal(root, "/dev/mtdblock0");
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expect_equal(rootfstype, "ubifs");
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// in case of duplicates, chooses the latter
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// also: works if the option is end of string
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buf = strdup("liminix console=ttyS0,115200 panic=10 oops=panic init=/bin/init loglevel=8 root=/dev/ubi0_4 rootfstype=ubifs fw_devlink=off mtdparts=phram0:18M(rootfs) phram.phram=phram0,0x40400000,18874368,65536 root=/dev/mtdblock0");
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parseopts(buf, &root, &rootfstype);
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expect_equal(root, "/dev/mtdblock0");
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expect_equal(rootfstype, "ubifs");
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// options may appear in either order
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buf = strdup("liminix fw_devlink=off root=/dev/hda1 rootfstype=ubifs foo");
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parseopts(buf, &root, &rootfstype);
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expect_equal(root, "/dev/hda1");
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expect_equal(rootfstype, "ubifs");
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buf = strdup("liminix rootfstype=ubifs fw_devlink=off root=/dev/hda1 foo");
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parseopts(buf, &root, &rootfstype);
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expect_equal(rootfstype, "ubifs");
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expect_equal(root, "/dev/hda1");
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// provides NULL for missing options
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buf = strdup("liminix rufustype=ubifs fw_devlink=off foot=/dev/hda1");
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parseopts(buf, &root, &rootfstype);
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if(rootfstype) die("expected null rootfstype, got \"%s\"", rootfstype);
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if(root) die("expected null root, got \"%s\"", root);
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// provides empty strings for empty options
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buf = strdup("liminix rootfstype= fw_devlink=off root= /dev/hda1");
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parseopts(buf, &root, &rootfstype);
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if(strlen(rootfstype)) die("expected empty rootfstype, got \"%s\"", rootfstype);
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if(strlen(root)) die("expected null root, got \"%s\"", root);
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expect_equal("01", pr_u32(1));
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expect_equal("ab", pr_u32(0xab));
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expect_equal("0abc", pr_u32(0xabc));
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expect_equal("aabc", pr_u32(0xaabc));
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expect_equal("deadcafe", pr_u32(0xdeadcafe));
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}
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#endif
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