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| #include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <limits.h>
#include <errno.h>
int getInt(char * const buff, const size_t N) {
int rc = -1;
if (fgets(buff, N, stdin)) {
long res = 0L;
char * endp = NULL;
size_t lg = strlen(buff);
buff[lg-1] = '\0';
res = strtol(buff, &endp, 10);
if (endp && *endp != '\0') {
fprintf(stderr, "Invalid number %s\n", endp);
}
else if (errno == ERANGE) {
fprintf(stderr, "Number isn't in the correct range\n");
}
else if (res > INT_MAX || res < INT_MIN) {
fprintf(stderr, "Number isn't in the correct range (INT_MIN < x < INT_MAX)\n");
}
else {
rc = res;
}
}
return rc;
}
void badLine(unsigned int num) {
fprintf(stderr, "%u\t: bad line !!\n", num);
}
int main(void)
{
FILE * f = NULL;
char buffStdin[10+1] = {0};
char buffLine[100+1] = { '\0' };
int x, y, found = 0;
unsigned int cnt = 0;
#ifdef WITH_SSCANF
int mapId, xx, yy;
#endif /* WITH_SSCANF*/
printf("Enter the X coordinate :\n");
x = getInt(buffStdin, sizeof(buffStdin)/sizeof(*buffStdin));
printf("Enter the Y coordinate :\n");
y = getInt(buffStdin, sizeof(buffStdin)/sizeof(*buffStdin));
f = fopen("data.txt", "r");
if (!f) {
fprintf(stderr, "Cannot open file data.txt\n");
exit(EXIT_FAILURE);
}
while (fgets(buffLine, sizeof(buffLine)/sizeof(*buffLine), f)) {
#ifdef WITH_SSCANF
++cnt;
rc = sscanf(buffLine, "./BD-ORTHO-%*d/%*d/%*d-%*d-%d/%*d-%d-%d-%*d.txt\n", &mapId, &xx, &yy);
if (rc == 3 && x == xx && y == yy) {
printf("OK, line %u matches: for x=%d and y=%d the map number is %d\n", cnt, x, y, mapId);
}
else if (rc != 3) {
badLine(cnt); continue;
}
#else
char const * lastSlash = strrchr(buffLine, '/');
++cnt;
if (lastSlash) {
int xFromFile, yFromFile;
char * dashOne, * dashTwo, * dashThree;
dashOne = strchr(lastSlash, '-');
if (dashOne) {
dashTwo = strchr(dashOne+1, '-');
if (dashTwo) {
dashThree = strchr(dashTwo+1, '-');
if (dashThree) {
char coordinateValue[4+1] = { '\0' };
strncpy(coordinateValue, dashOne+1, dashTwo-dashOne-1); coordinateValue[4] = '\0';
xFromFile = strtol(coordinateValue, NULL, 10);
strncpy(coordinateValue, dashTwo+1, dashThree-dashTwo-1); coordinateValue[4] = '\0';
yFromFile = strtol(coordinateValue, NULL, 10);
if (x == xFromFile && y == yFromFile) {
char * dashBeforeMapNum = NULL;
char mapNumStr[3+1] = { '\0' }; int mapNum = 0;
printf("OK, line %u matches, now looking for the map id.\n", cnt);
buffLine[lastSlash-buffLine] = '\0';
dashBeforeMapNum = strrchr(buffLine, '-');
if (dashBeforeMapNum) {
strncpy(mapNumStr, dashBeforeMapNum+1, 3);
mapNumStr[3] = '\0';
mapNum = strtol(mapNumStr, NULL, 10);
printf("OK, for x:%d and y:%d, the map number is %d\n", x, y, mapNum);
found = 1;
break;
}
else {
badLine(cnt); continue;
}
}
else {
continue;
}
}
else {
badLine(cnt); continue;
}
}
else {
badLine(cnt); continue;
}
}
else {
badLine(cnt); continue;
}
}
else {
badLine(cnt); continue;
}
#endif /* WITH_SSCANF*/
}
fclose(f);
if (!found) {
printf("Sorry, no matching entry found\n");
}
return 0;
} |
