7 changed files with 855 additions and 787 deletions
@ -1,3 +1,6 @@
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lib_LTLIBRARIES = libeasycsv.la
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libeasycsv_la_SOURCES = easycsv.c
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libeasycsv_la_SOURCES = \
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_easycsv.c \
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_easycsv.h \
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easycsv.c
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include_HEADERS = ../include/easycsv.h
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@ -0,0 +1,506 @@
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#include "_easycsv.h" |
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/* (Constructor) Initialise _easycsv */ |
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_easycsv* |
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_easycsv_priv_init(const char *fp, |
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const EASYCSV_MODE mode, |
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const EASYCSV_ERRORMSG error) |
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{ |
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_easycsv *_priv = malloc(sizeof(_easycsv)); |
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_priv->file = NULL; |
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_priv->temp = NULL; |
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_priv->fp = NULL; |
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_priv->tmpfp = NULL; |
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_priv->rows = 0; |
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_priv->cols = 0; |
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#ifdef EASYCSV_DEBUG |
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_priv->start = 0; |
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#endif |
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_priv->error = error; |
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/* Open file according to mode */ |
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switch (mode) { |
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case EASYCSV_R: { |
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_priv->file = fopen(fp, "r"); |
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break; |
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} |
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case EASYCSV_W: { |
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_priv->file = fopen(fp, "w"); |
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break; |
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} |
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default: { |
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_easycsv_printerror(_priv, EASYCSV_UNKNOWNIOMODE); |
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_easycsv_priv_free(_priv); |
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return NULL; |
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} |
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} |
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if (_priv->file == NULL) |
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{ |
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_easycsv_printerror(_priv, EASYCSV_OPENFAIL); |
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_easycsv_priv_free(_priv); |
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return NULL; |
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} |
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size_t stfp = strlen(fp); |
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/* Allocate memory for char* */ |
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_priv->fp = malloc(stfp + 1); // + 1 for null
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strcpy(_priv->fp, fp); |
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/* Calculate rows and cols if file exists */ |
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if (access(_priv->fp, F_OK) == 0) { |
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_priv->rows = _easycsv_rows(_priv, mode); |
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_priv->cols = _easycsv_columns(_priv, mode); |
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} |
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if (mode == EASYCSV_W) { |
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/* csv->tmpfp = malloc(16 + stfp + 1); */ |
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/* strncpy(csv->tmpfp, prefix, 16); */ |
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/* strncat(csv->tmpfp, fp, stfp); */ |
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do { |
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/* Write to temporary file */ |
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unsigned int i = 1; |
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char buffer[21] = "/tmp/easycsv-"; // 13 char, 3 for digits, 4 for .csv, 1 for NULL
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if (i < 100) |
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strncat(buffer, "0", 1); |
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if (i < 10) |
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strncat(buffer, "0", 1); |
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sprintf(buffer + strlen(buffer), "%i", i); |
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strcat(buffer, ".csv"); |
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if (access(buffer, F_OK) < 0) { |
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i++; |
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} |
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else { |
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_priv->tmpfp = malloc(21); |
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strncpy(_priv->tmpfp, buffer, 21); |
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break; |
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} |
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} while (1); |
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_priv->temp = fopen(_priv->tmpfp, "w"); |
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if (_priv->temp == NULL) { |
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_easycsv_printerror(_priv, EASYCSV_OPENFAIL); |
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_easycsv_priv_free(_priv); |
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return NULL; |
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} |
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/*
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#ifdef EASYCSV_DEBUG |
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printf("[%i] easycsv_debug: temp file %s opened\n", clock() - csv->start, csv->tmpfp); |
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#endif*/ |
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/*
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if (freopen(csv->fp, csv->mode, csv->file) == NULL) { |
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fprintf(stderr, "easycsv: failed to set temporary file %s to %s mode\n", csv->tmpfp, csv->mode); |
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return NULL; |
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} |
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if (freopen(csv->tmpfp, csv->mode, csv->temp) == NULL) { |
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fprintf(stderr, "easycsv: failed to set temporary file %s to %s mode\n", csv->tmpfp, csv->mode); |
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return NULL; |
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} |
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*/ |
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} |
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return _priv; |
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} |
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/* (Destructor) Free _easycsv memory */ |
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void |
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_easycsv_priv_free(_easycsv *_priv) |
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{ |
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/* ARGS CHECK */ |
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if (_priv == NULL) |
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return; |
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/* ARGS CHECK */ |
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if (_priv->file != NULL) |
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fclose(_priv->file); |
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if (_priv->temp != NULL) |
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fclose(_priv->temp); |
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if (_priv->fp != NULL) |
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free(_priv->fp); |
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if (_priv->tmpfp != NULL) |
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free(_priv->tmpfp); |
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free(_priv); |
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} |
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int |
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_easycsv_update(_easycsv *csv) |
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{ |
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/* ARGS CHECK */ |
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if (csv == NULL) { |
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_easycsv_printerror(csv, EASYCSV_NULLCSV); |
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return -1; |
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} |
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/* ARGS CHECK */ |
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/* Set temp file to read binary */ |
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if (freopen(csv->tmpfp, "rb", csv->temp) == NULL) { |
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_easycsv_printerror(csv, EASYCSV_REOPENFAIL); |
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easycsv_free(csv); |
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return -1; |
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} |
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/* Set file to write binary */ |
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if (freopen(csv->fp, "wb", csv->file) == NULL) { |
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_easycsv_printerror(csv, EASYCSV_REOPENFAIL); |
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easycsv_free(csv); |
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return -1; |
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} |
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/* Copy entire file */ |
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char buf[BUFSIZ]; |
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size_t size;
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while (size = fread(buf, 1, BUFSIZ, csv->temp)) { |
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fwrite(buf, 1, size, csv->file); |
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} |
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/* Set temp file back to write */ |
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if (freopen(csv->tmpfp, "w", csv->temp) == NULL) { |
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_easycsv_printerror(csv, EASYCSV_REOPENFAIL); |
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easycsv_free(csv); |
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return -1; |
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} |
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/* Set file back to read */ |
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if (freopen(csv->fp, "r", csv->file) == NULL) { |
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_easycsv_printerror(csv, EASYCSV_REOPENFAIL); |
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easycsv_free(csv); |
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return -1; |
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} |
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return 0; |
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} |
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int |
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_easycsv_rows(_easycsv *_priv, |
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const EASYCSV_MODE mode) |
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{ |
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// no need to check _priv for NULL
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if (_easycsv_rewind(_priv, mode) < 0) |
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return -1; |
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int rows = 1; |
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char c; |
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/* Go through each character in the file and count the number of \n
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in it */ |
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while ((c = fgetc(_priv->file)) != EOF) { |
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if (c == '\n') rows++; |
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} |
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return rows; |
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} |
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int |
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_easycsv_columns(_easycsv *_priv, |
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const EASYCSV_MODE mode) |
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{ |
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// no need to check _priv for NULL
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/* Prepare it for reading */ |
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if (_easycsv_rewind(_priv, mode) < 0) return -1; |
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/*
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1. check if empty file |
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2. check if only one column -> 0 commas |
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3. if >1 column, n commas = n+1 columns |
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*/ |
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int col = 1; |
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char c; |
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while ((c = fgetc(_priv->file)) != '\n') { |
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if (c == ',') col++; |
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} |
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return col; |
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} |
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char* |
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_easycsv_getrow(const _easycsv *csv, |
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const unsigned int row) |
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{ |
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/* ARGS CHECK */ |
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if (csv == NULL) { |
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_easycsv_printerror(csv, EASYCSV_NULLCSV); |
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return NULL; |
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} |
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if (row > csv->rows) { |
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_easycsv_printerror(csv, EASYCSV_OVERMAXROW); |
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return NULL; |
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} |
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if (row == 0) { |
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_easycsv_printerror(csv, EASYCSV_ZEROROW); |
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return NULL; |
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} |
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/* END ARGS CHECK */ |
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/* Allocate memory */ |
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char *str = malloc(BUFSIZ); |
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/* Set file pointer to start */ |
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rewind(csv->file); |
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for (int i = 1; i < row; i++) |
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{ |
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/* skip until row is reached */ |
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fscanf(csv->file, "%*[^\n]\n", NULL); |
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} |
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/* Grab the row and store it in str */ |
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fscanf(csv->file, "%s\n", str); |
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// printf("row: %s\n", str);
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return str; |
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} |
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int |
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_easycsv_rewind(_easycsv *_priv, |
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const EASYCSV_MODE mode) |
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{
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/* Check if empty file */ |
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if (fscanf(_priv->file, "\n") == EOF) { |
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_easycsv_printerror(_priv, EASYCSV_EMPTYCSV); |
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return -1; |
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} |
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/* Check if file is readable */ |
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if (mode != EASYCSV_R) { |
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_easycsv_printerror(_priv, EASYCSV_UNREADABLE); |
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return -1; |
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} |
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/* Set file pointer to the start */ |
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rewind(_priv->file); |
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return 0; |
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} |
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int |
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_easycsv_getcolumn(const _easycsv *csv, |
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const char *col) |
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{ |
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/* ARGS CHECK */ |
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if (_easycsv_checkcsvandstring_one(csv, col) < 0) |
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return -1; |
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/* ARGS CHECK */ |
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/* Grab str of row 1 */ |
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char *firstrow = _easycsv_getrow(csv, 1);
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if (firstrow == NULL) { |
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_easycsv_printerror(csv, EASYCSV_ROWNOTEXIST); |
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return -1; |
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} |
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unsigned int commas = 0; |
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// printf("FIRST COLUMN: %s\n", firstrow);
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/* Find first occurance of col in firstrow */ |
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char *str = strstr(firstrow, col); |
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if (str == NULL) { |
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_easycsv_printerror(csv, EASYCSV_COLNOTEXIST); |
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return -1; |
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} |
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/* Count numbers of commas following str */ |
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char *c = strpbrk(str, ","); |
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while (c != NULL) { |
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commas++; |
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c = strpbrk(c + 1, ","); |
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} |
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/* no need to free c as it is already NULL at this point */ |
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// free((char*) str); apparently invalid pointer
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// printf("ROW: %i\nCOL: %i\n", row, csv->cols - commas);
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/*
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#ifdef EASYCSV_DEBUG |
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printf("[%i] rcv_commas: %i\n", clock() - csv->start, commas); |
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#endif |
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*/ |
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free(firstrow); |
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return csv->cols - commas; |
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} |
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/*
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int _easycsv_checkifvalue(struct easycsv *csv, const int col, const int row) |
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{ |
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const char *rowstr = _easycsv_getrow(csv, row); |
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return 0; |
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} |
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*/ |
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char* |
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_easycsv_getvalueinrow(const _easycsv *_priv, |
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const char *row, |
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const unsigned int col) |
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{ |
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size_t st; |
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char *pch = NULL; |
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/* If not first column */ |
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if (col != 1) { |
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/* Get first occurance of comma in str,
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the first value is ommited but not the comma */ |
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char *pch = strpbrk(row, ","); |
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/* Repeat until desired col is found */ |
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for (int i = 2; i < col; i++) {
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pch = strpbrk(pch + 1, ","); |
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} |
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} |
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/* Get span from start of string to first occurence
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of comma */ |
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st = strcspn(pch + 1, ","); |
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/* If 0, no string exists! */ |
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if (st == 0) { |
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_easycsv_printerror(_priv, EASYCSV_EMPTYVALUE); |
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return NULL; |
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} |
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char *val = malloc(st + 1); |
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strncpy(val, pch + 1, st); |
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strncat(val, "\0", 1); |
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return val; |
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} |
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char* |
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_easycsv_setcharptovalue(const _easycsv *_priv, |
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const char *rowstr, |
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const unsigned int col) |
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{ |
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char *pch = rowstr; |
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for (unsigned int i = 1; i < col; i++) { |
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pch = strchr(rowstr, ','); |
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if (pch == NULL) { |
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_easycsv_printerror(_priv, EASYCSV_NULLPTR); |
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return NULL; |
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} |
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pch++; |
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} |
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return pch; |
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} |
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void |
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_easycsv_printerror(const _easycsv *_priv, |
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const EASYCSV_ERROR error) |
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{
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switch (_priv->error) { |
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case EASYCSV_ERROROFF: return; |
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case EASYCSV_ERRORSTDOUT: _easycsv_geterror(_priv, error, stdout); break; |
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case EASYCSV_ERRORSTDERR:
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default: _easycsv_geterror(_priv, error, stderr); return; |
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} |
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} |
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void |
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_easycsv_geterror(const _easycsv *_priv, |
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const EASYCSV_ERROR error, |
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FILE *fs) |
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{ |
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#ifdef EASYCSV_DEBUG |
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fprintf(stderr, "[%i] ", clock() - _priv->start); |
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#endif |
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fputs("easycsv: ", fs); |
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switch (error) { |
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/* Generic errors */ |
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case EASYCSV_NOERROR: fputs("no error", fs); break; |
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case EASYCSV_NULLCSV: fputs("easycsv pointer is NULL", fs); break; |
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case EASYCSV_NULLPTR: fputs("pointer is NULL", fs); break; |
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case EASYCSV_EMPTYSTRING: fputs("string is empty", fs); break; |
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case EASYCSV_EMPTYVALUE: fputs("value in CSV file is empty", fs); break; |
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case EASYCSV_OVERMAXROW: fprintf(fs, "int exceeds row limit %i", _priv->rows); break; |
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case EASYCSV_OVERMAXCOL: fprintf(fs, "int exceeds column limit %i", _priv->cols); break; |
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case EASYCSV_ZEROROW: fputs("parameterised row number is zero", fs); break; |
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case EASYCSV_ZEROCOL: fputs("parameterised column number is zero", fs); break; |
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|
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/* File input/output errors */ |
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case EASYCSV_UNKNOWNIOMODE: fputs("unknown file IO mode", fs); break; |
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case EASYCSV_OPENFAIL: fputs("failed to open file", fs); break; |
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case EASYCSV_REOPENFAIL: fputs("failed to reopen file", fs); break; |
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case EASYCSV_EMPTYCSV: fputs("CSV file is empty", fs); break; |
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case EASYCSV_UNWRITABLE: fputs("CSV file is not in a writable mode", fs); break; |
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case EASYCSV_UNREADABLE: fputs("CSV file is not in a readable mode", fs); break; |
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case EASYCSV_UPDATEFAIL: fputs("CSV file has failed to update", fs); break; |
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case EASYCSV_UPDATETEMPFAIL: fputs("failed to update temp CSV file", fs); break; |
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case EASYCSV_FILEPTRFAIL: fputs("failed to move FILE pointer", fs); break; |
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|
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/* Non-existant elements */ |
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case EASYCSV_ROWNOTEXIST: fputs("given row does not exist", fs); break; |
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case EASYCSV_COLNOTEXIST: fputs("given column does not exist", fs); break; |
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|
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/* User-facing failure */ |
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case EASYCSV_PUSHCOLFAIL: fputs("failed to push value under column", fs); break; |
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case EASYCSV_COLNUMFAIL: fputs("failed to determine the column number of a value in the first row", fs); break; |
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default: fputs("unknown error, easycsv* is possibly NULL", fs); break; |
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} |
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|
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if (_priv->fp != NULL) |
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fprintf(fs, " in %s", _priv->fp); |
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|
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fputc('\n', fs); |
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} |
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|
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int |
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_easycsv_checkcsvandstring_one(const _easycsv *csv, |
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const char *one) |
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{ |
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if (csv == NULL) { |
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_easycsv_printerror(csv, EASYCSV_NULLCSV); |
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return -1; |
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} |
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|
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if (one == NULL) { |
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_easycsv_printerror(csv, EASYCSV_EMPTYSTRING); |
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return -1; |
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} |
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|
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return 0; |
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} |
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|
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int |
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_easycsv_checkcsvandstring_two(const _easycsv *csv, |
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const char *one, |
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const char *two) |
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{ |
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if (_easycsv_checkcsvandstring_one(csv, one) < 0) |
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return -1; |
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|
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if (two == NULL) { |
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_easycsv_printerror(csv, EASYCSV_EMPTYSTRING); |
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return -1; |
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} |
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return 0; |
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} |
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@ -0,0 +1,178 @@
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#ifndef _EASYCSV |
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#define _EASYCSV |
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|
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <unistd.h> |
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#include <sys/sendfile.h> |
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#include <sys/stat.h> |
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#include <fcntl.h> |
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#include <time.h> |
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#include <stdint.h> |
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|
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#include "easycsv_error.h" |
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|
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/* Generic type definitions for internal use */ |
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|
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typedef uint32_t row_t; // max length of 2^32 - 1
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typedef uint32_t column_t; |
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typedef char* rowstr; // non-const, to free it after usage
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|
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/** Flags for error messages */ |
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typedef enum { |
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EASYCSV_ERRORSTDERR = 0, |
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EASYCSV_ERROROFF, |
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EASYCSV_ERRORSTDOUT |
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} EASYCSV_ERRORMSG; |
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|
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/** Flags to facilitate changing modes during file copying phases */ |
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typedef enum { |
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EASYCSV_UNKNOWNMODE = 0, |
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EASYCSV_R, |
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EASYCSV_W |
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} EASYCSV_MODE; |
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|
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/** Flags to parameterise the easycsv_insertvalue */ |
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typedef enum { |
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EASYCSV_REPLACE, ///< (default) replaces word
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EASYCSV_CONCAT, ///< concantates word at the end
|
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EASYCSV_RCONCAT, ///< concantates word from the start
|
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} EASYCSV_VALMODE; |
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|
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/** Flags to parameterise sorting */ |
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typedef enum { |
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EASYCSV_ALPHA, ///< sort alphabetically
|
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EASYCSV_RALPHA, ///< sort reverse alphabetically
|
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EASYCSV_NUMER, ///< sort numerically, from lowest value to highest
|
||||
EASYCSV_RNUMER ///< sort from highest value to lowest
|
||||
} EASYCSV_SORT; |
||||
|
||||
/* Flags denoting cell type */ |
||||
typedef enum { |
||||
EASYCSV_NONE, |
||||
EASYCSV_STRING, |
||||
EASYCSV_INT, |
||||
EASYCSV_FLOAT, |
||||
EASYCSV_UNKNOWNTYPE |
||||
} _EASYCSV_TYPE; |
||||
|
||||
/* Private easycsv members */ |
||||
typedef struct _easycsv { |
||||
FILE *file; // original CSV file
|
||||
FILE *temp; // temporary CSV file for writing
|
||||
char *fp; |
||||
char *tmpfp; |
||||
unsigned int rows; |
||||
unsigned int cols; |
||||
EASYCSV_ERRORMSG error; |
||||
#ifdef EASYCSV_DEBUG |
||||
clock_t start; |
||||
#endif |
||||
} _easycsv; |
||||
|
||||
/* (Constructor) Initialise _easycsv */ |
||||
_easycsv* |
||||
_easycsv_priv_init(const char*, |
||||
const EASYCSV_MODE, |
||||
const EASYCSV_ERRORMSG); |
||||
|
||||
/* (Destructor) Free _easycsv memory */ |
||||
void |
||||
_easycsv_priv_free(_easycsv*); |
||||
|
||||
/* Verifies mode of file */ |
||||
// int _easycsv_checkmode(struct easycsv*, const char);
|
||||
|
||||
/* Copies data from temp FILE to file FILE */ |
||||
int |
||||
_easycsv_update(_easycsv*); |
||||
|
||||
/* Rewind easycsv, checks for readability */ |
||||
int |
||||
_easycsv_rewind(_easycsv*, |
||||
const EASYCSV_MODE); |
||||
|
||||
/* Returns string of a specific row,
|
||||
includes the '\n' character as well! */ |
||||
char* |
||||
_easycsv_getrow(const _easycsv*, |
||||
const unsigned int); |
||||
|
||||
/* Return column number of a named column */ |
||||
int |
||||
_easycsv_getcolumn(const _easycsv*, |
||||
const char*); |
||||
|
||||
/* Verifies the type of the value (eg: string or int) */ |
||||
_EASYCSV_TYPE |
||||
_easycsv_checktype(const _easycsv*, |
||||
const int, |
||||
const int); |
||||
|
||||
/* Verifies if there is a value or not */ |
||||
int |
||||
_easycsv_checkifvalue(const _easycsv*, |
||||
const int, |
||||
const int); |
||||
|
||||
/* Grab const char* in row */
|
||||
char* |
||||
_easycsv_getvalueinrow(const _easycsv*, |
||||
const char*, |
||||
const unsigned int); |
||||
|
||||
/* Returns char pointer to start of value in rowstr */ |
||||
char* |
||||
_easycsv_setcharptovalue(const _easycsv*, |
||||
const char*, |
||||
const unsigned int); |
||||
|
||||
/* Insert value in row in specific column */ |
||||
char* |
||||
_easycsv_insertvalueinrow(const _easycsv*, |
||||
const char*, |
||||
const char*, |
||||
const unsigned int); |
||||
|
||||
/* Calculate rows */ |
||||
int |
||||
_easycsv_rows(_easycsv*, |
||||
const EASYCSV_MODE); |
||||
|
||||
/* Calculate columns*/ |
||||
int |
||||
_easycsv_columns(_easycsv*, |
||||
const EASYCSV_MODE); |
||||
|
||||
void |
||||
_easycsv_printerror(const _easycsv*, |
||||
const EASYCSV_ERROR); |
||||
|
||||
/* Print error from _easycsv struct in stderr */ |
||||
void |
||||
_easycsv_geterror(const _easycsv*, |
||||
const EASYCSV_ERROR, |
||||
FILE*); |
||||
|
||||
/* Check if easycsv* and const char* are NULL */ |
||||
int |
||||
_easycsv_checkcsvandstring_one(const _easycsv*, |
||||
const char*); |
||||
|
||||
/* Check if easycsv* and two const char* are NULL*/ |
||||
int |
||||
_easycsv_checkcsvandstring_two(const _easycsv*, |
||||
const char*, |
||||
const char*); |
||||
|
||||
/* Verifies if the string is not NULL or empty, returns 0 on success and -1 on failure */ |
||||
// int _easycsv_checkstring(const char*);
|
||||
|
||||
/* Verifies if easycsv is not NULL or unallocated */ |
||||
// int _easycsv_checkeasycsv(const struct easycsv*);
|
||||
|
||||
/* Verifies if int is */ |
||||
// int _easycsv_checkunsigned(const int);
|
||||
|
||||
#endif |
||||