pdfio/pdfio-string.c

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//
// PDF dictionary functions for PDFio.
//
// Copyright © 2021 by Michael R Sweet.
//
// Licensed under Apache License v2.0. See the file "LICENSE" for more
// information.
//
#include "pdfio-private.h"
//
// Local functions...
//
static int compare_strings(char **a, char **b);
//
// 'pdfioStringCreate()' - Create a durable literal string.
//
// This function creates a literal string associated with the PDF file
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// "pdf". The "s" string points to a nul-terminated C string.
//
// `NULL` is returned on error, otherwise a `char *` that is valid until
// `pdfioFileClose` is called.
//
char * // O - Durable string pointer or `NULL` on error
pdfioStringCreate(
pdfio_file_t *pdf, // I - PDF file
const char *s) // I - Nul-terminated string
{
char *news; // New string
char **match; // Matching string
PDFIO_DEBUG("pdfioStringCreate(pdf=%p, s=\"%s\")\n", pdf, s);
// Range check input...
if (!pdf || !s)
return (NULL);
// See if the string has already been added...
if (pdf->num_strings > 0 && (match = (char **)bsearch(&s, pdf->strings, pdf->num_strings, sizeof(char *), (int (*)(const void *, const void *))compare_strings)) != NULL)
return (*match);
// Not already added, so add it...
if ((news = strdup(s)) == NULL)
return (NULL);
if (pdf->num_strings >= pdf->alloc_strings)
{
// Expand the string array...
char **temp = (char **)realloc(pdf->strings, (pdf->alloc_strings + 128) * sizeof(char *));
if (!temp)
{
free(news);
return (NULL);
}
pdf->strings = temp;
pdf->alloc_strings += 128;
}
// TODO: Change to insertion sort as needed...
pdf->strings[pdf->num_strings ++] = news;
if (pdf->num_strings > 1)
qsort(pdf->strings, pdf->num_strings, sizeof(char *), (int (*)(const void *, const void *))compare_strings);
PDFIO_DEBUG("pdfioStringCreate: %lu strings\n", (unsigned long)pdf->num_strings);
return (news);
}
//
// 'pdfioStringCreatef()' - Create a durable formatted string.
//
// This function creates a formatted string associated with the PDF file
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// "pdf". The "format" string contains `printf`-style format characters.
//
// `NULL` is returned on error, otherwise a `char *` that is valid until
// `pdfioFileClose` is called.
//
char * // O - Durable string pointer or `NULL` on error
pdfioStringCreatef(
pdfio_file_t *pdf, // I - PDF file
const char *format, // I - `printf`-style format string
...) // I - Additional args as needed
{
char buffer[8192]; // String buffer
va_list ap; // Argument list
// Range check input...
if (!pdf || !format)
return (NULL);
// Format the string...
va_start(ap, format);
vsnprintf(buffer, sizeof(buffer), format, ap);
va_end(ap);
// Create the string from the buffer...
return (pdfioStringCreate(pdf, buffer));
}
//
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// '_pdfioStringIsAllocated()' - Check whether a string has been allocated.
//
bool // O - `true` if allocated, `false` otherwise
_pdfioStringIsAllocated(
pdfio_file_t *pdf, // I - PDF file
const char *s) // I - String
{
return (pdf->num_strings > 0 && bsearch(&s, pdf->strings, pdf->num_strings, sizeof(char *), (int (*)(const void *, const void *))compare_strings) != NULL);
}
//
// 'compare_strings()' - Compare two strings.
//
static int // O - Result of comparison
compare_strings(char **a, // I - First string
char **b) // I - Second string
{
return (strcmp(*a, *b));
}