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POLog file rotation name
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copied!<pre>I have written this simple C program that changes the rotation file name. Eg: For A_B_C_1 Need to rotate it to A_B_C_2 and if A_B_C need to rotate it to A_B_C_1 Problem is the strncat is not working as expectedly. It is giving me output like: A_B_C_1 (Works fine for single instance) A_B_C_2 A_B_C_23 A_B_C_2324 Logic used is simple:get the last digit in the string if it exists. If it does not simply append _1 (This one is working fine) If it does - extract the number, increment it and append to the new string. Is there some std library that does this? Gives error on calling this method in a loop / multiple times.... </pre> <blockquote> <p>I am not able to debug the cause..... Need help on this,Please guide.</p> </blockquote> <pre> int getRotationFileName(char *sFileName,char *sNewFileName) { char sTmpFile[256]; int newRotation; memset(sTmpFile,NULL,sizeof(sTmpFile)); strncpy(sTmpFile, sFileName, strlen(sFileName)); char *tokenPtr; strtok(sFileName,"_"); //a strtok(NULL, "_"); //b strtok(NULL, "_"); //c tokenPtr = strtok(NULL, "_"); //1 printf("sTempFile [%s], sFileName [%s], token [%s]", sTmpFile,sFileName,tokenPtr); if(tokenPtr!= NULL)//Last - exists { newRotation = atoi(tokenPtr); int newLen = strlen(sTmpFile); int oneLen = strlen(tokenPtr); memset(sNewFileName, NULL, sizeof(sNewFileName)); printf("sNewFileName is prior: %s and len is %d \n", sNewFileName, (newLen-oneLen)); printf("sTempName is prior: %s", sTmpFile); strncpy(sNewFileName,sTmpFile, (newLen-oneLen)); printf("diff is %d\n", (newLen-oneLen)); printf("sNewFileName before concat %s \n", sNewFileName); newRotation++; sprintf(sNewFileName,"%s%d",sNewFileName, newRotation); sNewFileName[strlen(sNewFileName)]='\0'; printf("sNewFileName after concat %s \n", sNewFileName); } else { printf("in else TmpFile [%s] , New File [%s], len %d",sTmpFile, sNewFileName,strlen(sTmpFile)); strcat(sTmpFile,"_1"); strncpy(sNewFileName,sTmpFile, strlen(sTmpFile)); } strcpy(sFileName, sNewFileName); printf("\nNew file created is %s\n",sNewFileName); return 1; } </pre> <blockquote> <p>Seems to be a problem on line: strncpy(sNewFileName,sTmpFile, (newLen-oneLen));</p> <p>Feedback: The code formatter is not working correctly on this site for Chrome browser</p> </blockquote>

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